Hello,
Gaming mouses are considered something neat to get by some players ; honestly, it all depends tastes. On my side, I personally use a classic mouse, two buttons and the scroll : and with the keyboard, it's more than enough. Having buttons all over the place makes it confusing and increase the risk to mess things up while playing ; and also tends to dragclicking and autoclicking, which create this tendancy of having a gaming mouse not really well-seen as it offers an unfair advantage over others. With that said, it's really up to you.