Out of these two mice

Neither?

First, you don't really want a wireless mouse to play, unless you are on a laptop on the go all the time.

Second, I've never heard of Dynex, so I can't give a very good view on it, but that alone should be a bit of a point to look at other mice.

If I may, what was it about those two mice that interested you? Price? And if so, could I perhaps have your price range, and I'll see what I can find

More than likely the pricing and the fact that they are available at Walmart are what made the OP look to these mice.

Cheap mouse: http://www.newegg.com/Product/Product.aspx?Item=N82E16826193089

Mouse I have currently been using without issues: http://www.newegg.com/Product/Product.aspx?Item=N82E16826153168&cm_re=razer-_-26-153-168-_-Product

Gaming mice buyers guide: http://linustechtips.com/main/topic/272889-a-guide-to-buying-the-right-mouse/

just use whichever is most comfortable then.