The simple reason that this is the best digital version of this game is that Earl Boen, the original voice actor for LeChuck, lends his voice to Episode 1 in this version. Steam uses Adam Harrington, and Telltale will only let you download from them if you bought the game back in the day. For that reason alone, you ought to get the game from GOG. HOWEVER, Episodes 4 and 5 are broken in this release. But without a workaround. At a certain point in both episodes the game will crash - in EP4, this will be when you visit the Voodoo Lady's hut. In 5, when you visit the jungle. Don't worry! The autosave has your back. Once you hit these crashes, go to the game installation directory and delete all *.dlg and *.chore files. Once done, the episodes will play normally. I don't recommend doing this fix *before* the crashes, simply because I do not know what side effects they have. Ideally, GOG would give this game a quick QA pass.
Sam & Max was born out of one dude's desire to make fun of his little brother by messing up the comics he was drawing out of boredom. Eventually, that one dude starting drawing original ones and at some point in the 1980s there were enough issues of the comic for approximately 10.3567 and a half people to own one. A crime fighting dog and rabbit who fight crime using their crime fighting tactics. There's no rhyme or reason as to why Sam & Max is special; it just is. Fast forward to 1990ish or whatever and that one dude - who we'll correctly identify as Steve Purcell - got himself a cushy job at Lucasfilm doing things. One of those things involved being an artistic head honcho on a game you probably never heard of called Monkey Island 2 or whatever I dunno it's nothing special forget about it. He kept doodling this weird little rabbit which to his coworkers' surprise was actually a character from a hugely not-famous comic from a decade before. It was Max. The little Max doodle got itself imported as a SCUMM sprite and for some reason Steve Purcell was allowed to make an entire game about him and his dog friend Sam going all over America looking for a soggy Bigfoot who managed to escape from the circus to elope with his giraffe-necked sweetheart. Following the classic adventure game formula, you will be required to turn kittens inside out, make small talk with budding roadside fast food joint managers and bungie jump from Mount Rushmore in order to locate the Bigfoot and return him to his rightful place in a block of ice inside a circus tent somewhere. Oh and there's a country & western singer from Brighton who keeps trying to ruin your day. You might want to deal with him. Hit the Road is the funniest and most philosophical experience you will ever have. Until you have one which is both funnier and more philosophical, anyway.
Day one DLC awarded to pre-orderers. Sorry if you missed out on that. Stop breaking up games into pieces! There was no reason for the campaign and "skin" to be seperated from the main game. HOWEVER, the soundtrack is fantastic. It would be wonderful if GOG supported selling soundtracks as separate products. Otherwise, GOG needs to stop allowing DLC on its store. GOG is in a unique position wherein it can discourage destructive practices like DLC and pre-order content and it is choosing not to for some reason. Sort it out, GOG! Buy this for the soundtrack if you missed out on the pre-order deal, anyway, I suppose. It's not as bad as it could be. Incidentally, why is Omerta even still in the catalogue?