The G2S is the budget version of the SSA. It has a different anti-walk (hammer pin) mechanism that is probably cheaper to manufacture than the MILSPEC design. It also has no fancy etched logo and serial number on the trigger, which by the way you can't see when fitted anyway. Apart from that there is no difference in feel and trigger weights. Geissele claims they don't do as much quality control testing on the G2S as the SSA but I suspect that is more a justification for the higher price of the SSA than making a convincing argument the G2S is inferior. I have used both and I cannot tell the difference once fitted.
As for choosing gun parts based on their 'looks' you are talking a foreign language to me. Guns are utilitarian machines and if you want to factor in aesthetics then this potentially (but not always) compromises functionality. If this gun is more an avocation than a work gun then you have to feel good about it and it sounds like looks are important to you.
I cannot see the mechanical benefit of a flat trigger over a traditional curved. Again, each to their own.
As for choosing gun parts based on their 'looks' you are talking a foreign language to me. Guns are utilitarian machines and if you want to factor in aesthetics then this potentially (but not always) compromises functionality. If this gun is more an avocation than a work gun then you have to feel good about it and it sounds like looks are important to you.
I cannot see the mechanical benefit of a flat trigger over a traditional curved. Again, each to their own.