That is some what debatable....
Sure, the LYNX is significantly more powerful and the sound is far better, but the screen is even smaller, and console is bigger... if not for that screen res being so low vertically, id rate the LYNX a fair bir higher, but it is, and i wont.
When you McWill them both, the quality of the original screen is somewhat irrelevant.
When it comes to games, the Game Gear can play Master System games too, after a McWill screen mod it does a perfect job, and there are some awesome Master System games out there. The LYNX doesnt really have many that do much for me.