I haven't used the HTC Rezound, but I love the LG Spectrum's 4.5", IPS HD screen. I had the LG Revolution (1st Gen LTE), and this is much faster with the dual-core. It takes great photos and video, too.
The standard battery (on all LTE phones) does not last long enough, and the back is quite slippery. I have the 3000 mAH battery, and it's cover, and that lasts all day, and the cover provides a better texture. It IS thicker, but I like it so I have something to hold on to.
Good luck with whatever you choose.