I'd say it's a matter of preference. Historically, gamepads haven't been very popular among PC gamers and few games offered good gamepad controls. It's different today, many games (especially in certain genres like platformers) are designed with gamepads in mind. Most of these games are still playable with mouse and keyboard, and I generally prefer playing platformers with the keyboard as long as the game isn't too reliant on analog stick aiming or the like.

Still, the vast majority of PC games play better with keyboard and mouse.

I arrived relatively late in life to computer RPGs (for your average gamer), and The Witcher 1 was a very gentle entry point (on easy difficulty). If you are going to play the franchise, why not start with the beginning? The story is excellent and full of choices. Each chapter is contained in its own part of the map, so it won't be as overwhelming as a full open world.

https://www.gog.com/game/vampire_the_masquerade_bloodlines_2
March 2020 - Got a time machine? ;-)

If you are serious with the Witcher I really recommend reading the (original) books - they're really great. CDPR did a hell of a job of bringing this world to life. Witcher 1 is very different gameplay-wise to the other titles - and has a certain... juvenile... touch.
Don't let them pull your leg ;-)
I know people who spent hundreds of hours in that game - it's pretty famous for a reason.
It's not my kind of game, but since you already have it, just give a try and see for yourself. Just be warned that if it "clicks" you might be hooked for quite a while ;-)

Thanks for the recommendation. I'm going to do that. Witcher I and Firewatch are going to be my fiirst games to try.

Congratulations on joining GOG! You can use scp toolkit to play games with your PS3 controller. That might make learning the controls easier.

And have you looked at Her Story? It's not exactly a "game" so much as an interactive movie, but it might fit what you were interested in.

PC gaming can be a little quirky sometimes, you have a lot of settings to adjust, different operating systems may have some problems, hardware differences may impede the game from launching or have some weird bugs etc. Many older games work better or require 3rd party software to improve game experience (or even work at all).

Usually the most important setting on any video game is resolution, the better visuals are made with your monitor native resolution. Lets say your ASUS machine have a 1920x1080 monitor, thats is the where crisper image is, when set in the game but it can tax your hardware so much the game start to stutter, that way is usually better to lower the resolution a little, like 1600x900 so the game can play flluidly.
Game visual setting (like quality) can be tweaked as well and usually the max settings are very demanding and bring very diminishing returns in visual fidelity.

The Asus G750 is a nice machine and will run pretty much any game without much trouble, except maybe the last Assassins Creed that run like crap in any computer.

Lenovo Ideapad is a nice all round laptop wich may be able to run most games, the newer stuff you may have to lower the resolution and use lower quality settings.

The Lenovo Yoga is more suitable for older and "indie" games with less graphical demands.

Other people have already made solid recommendations but I thought I'd add this: you ought to check out some ARPGs like Diablo 1, The Incredible Adventures of Van Helsing and Titan Quest. I say this because you said you have trouble with
complicated controls for some other games and you can play all of these with your mouse alone, if you want to, except for some keyboard hotkeys, which are easy to use, being single key presses. Also, unless I'm mistaken these games all have manuals which will tell you the hotkeys, and/or explain them in game.

About the games, you have quite a good list, my recomendation is to try a couple (or watch some youtube videos) to see what is more appealing to you, like movies amd books, there is a infinite genres and most people like and dislike some genres.

Besides the games you actually have, if you like platformers, metroidvanias and such I can recomend (those tend to play better with a controller)
Ori and the Blind Forest
Hollow Knight
Limbo is a very nice game and you may enjoy the style, and is very easy
Trine 1 and 2 are very easy and fun games
Spelunky is good as well but may not appeal to every one.

Turn based strategy games I really like Into the breach wich plays a little like chess.
XCOM is a good game as well although to be honest never played it myself
You may also like Civilization games or manegerial like Cities Skyline where you build and manage a city(not on GOG though, pretty sure there must be something alike)

If you find them a little expensive, since you are buying a lot of games at the same time, GOG has a sale every week with different games and usually most games go on sale one time or another, you can wait a few weeks and check the sale stuff. Very good games cand be bought very cheap, if you are unsure to try a discounted game may be the best way.

Most of the games I recomended will run fine on any of your laptops, althoug for Ori and the bling forest you may have to lower the resolution a little on the YOGA

Edit: fixing links
J

I used to have one (don't ask) not anymore unless I was remote viewing that review

Use Youtube videos if you get stuck in a game. Also get a good mouse and keyboard plus an Xbox controller for Windows. You might also want to play games on Easy difficulty setting if you haven't played games before. Do the tutorial and maybe read a guide on how to play.

Start with something easy like Firewatch that can ease you into PC gaming.And remember: practice makes perfect.

A lot of games I enjoy a lot cannot really be played on your lap.

Having a hot pc in your lap for extended time will give you burns.

That comment conjures up a few unmentionable imaginations! Hahahaha

But seriously, use a breadboard, or you can buy USB powered laptop platforms that have their own fans.

Since you're new to GOG, why not try forum mafia? You could get to know more users.
Link is here