I just game Offline, Campaigns is all I do so, my opinion is solely based on that.
I have the G7 & G9 mouse and even after almost 1 year, somehow, I still prefer the G7 more than the G9... I can't put a finger on it and the G9 has more features than the G7 but I still feel that the ergos on the G7 are much better than on the G9.
Now, the only downfall of the G7 are the batteries, it is a wireless battery and it comes with 2 (at least mine did) but it seems that they don't hold a lot of charge... other than that, I had no problem with settings and the software is top notch.
On the other hand, I had never heard of the mouse you're mentioning so... take my opinion with a grain of salt