Good point, by better I did mean wireless though. The G5 just has a weight cartridge in place of a battery. So the G5 is more configurable. Some people say the weights are stupid though.
Honestly at first glance I didn't know if the weights would be worth even my time to put them in. But, after a couple months of use, I really like it, I like my mouse a little heavier than the mighty mouse because it gives me a little more feel. But, at the same time, I can understand the idea of having a wireless version of the mouse, however, in my case, the wireless was not necessary and the weights were an added bonus...