It seems that you're using an outdated browser. Some things may not work as they should (or don't work at all).
We suggest you upgrade newer and better browser like: Chrome, Firefox, Internet Explorer or Opera

I am leaning towards GTB. I already have GSB 1 but I want to get the expansions. which one would you recommend?
Complete your GSB1:
_ GTB is quite boring
_ GSB2 is very expensive for the few adds.
if you like super wide screen support than get this one. This game also has better PC resource usage, and allows you to completely change the look of your ships (from windows, lights.... lots of stuff).
GSB2 is buggy and dead (zero post in 2016),
but for GSB1 one mod is still built at now.