If you can find them, the Amiga joysticks are rather comfortable and work well.
I only have three games for mine. Parsec (which has voice through the voice attachment), Burgertime, and Treasure Island. Parsec is considered one of the better games on the system. If you like Space Invaders the TI has a really good port called TI Invaders. Burgertime is good but the game has a flaw that I find annoying. The in game music plays while you are moving around but when you walk across any part of the hamburger the music stops. That's not what I find annoying. Once the burger piece falls or you stop walking across it the music starts again but from the very beginning instead of starting where it left off. That's the only thing about it I don't like.
The TI is not a bad system but I have not tried to dig too much into it to find out what all it has to offer. Mine rarely gets used. Even for a 16-bit computer the Atari 8-bits actually blow the TI out of the water. It does have good graphics and sounds, though. I'll give it that.