It all depends about how you do practice and often. If you're not a spartan, perhaps that only a pair of fighting gloves could do otherwise, to get them to last longer, a bag pair can be hefty fine. Rival are very good, solid with a very tight grip for the wrist, in that respect they are one of the most interestingly innovative on the market. You do not go wrong with these pairs. I always loved the Grant a lot too, would I box pro, that's likely the brand I'd go with.
As for the Adidas, I haven't toyed with them much or know personally people using them so I couldn't say much about them but to know how good are the Rival, I'd go for them on a safe value point of view.