Id say the key to deciding between these two phones will be how into rooting and flashing you are. With no s-off and nothing but hope that it will come, you know what you're gonna get with the rezound, for now and the foreseeable future. unlocking the nexus bootloader and rooting it took a handful of adb commands and all of 10 minutes; it was ridiculously easy. theres a bunch of roms and custom kernels already and with the new leaked radio and some UVing, i have yet to miss a call and the battery is much improved. being a former tbolt owner i would NOT want to be stuck waiting for HTC and verizon to bring me ics; you could end up waiting until July based on their track record. obviously i'm biased, and ICS is such a dramatic change that I could honestly never go back to gingerbread. the leaked ics sense looks almost exactly like gingerbread, which is disappointing.
that being said, most devs for the nexus operate under the assumption that you're competent with adb. if you've never used it or aren't comfortable using it, you may be a bit lost at times.
i just know that personally, the rezound wouldve driven me insane. every time i saw lets golf 2 in my app drawer a little part of me would die
There hasn't BEEN a leaked ROM. The one you're talking about is a cobbled together version of Sense 3.0 and ICS. No one knows what Sense 4.0 will look like.