Depends what you like if your more into music the choice would be the rezound but if that stuff isn't really that important to you go with the razr. it is an overall better phone, it is better build quality, thinner faster and feels better in the hand. if this doesn't help look at these reviews from the professionals.
Rezound: http://www.engadget.com/2011/11/15/htc-rezound-review/