See above.
I was on a MIUI GB ROM with my DX, 3500mAh extended battery. That got me roughly 28 hours usage. With the Rezound on a ICS ROM with devices settings kept in mind for power usage, I get 20+ out of the Rezound on a stock battery.
Speaking on issues of form factor alone, you'll be MUCH more comfortable with the Rezound in hand. length and width is almost the same size as the DX, whereas the RAZR gets it's thin design by pancaking some components, it ended up being both longer and wider than the Rezound just to achieve it's thin design. Weight wise (still don't understand how this can actually be considered an issue) the RAZR MAXX put on a lot of extra weight to get that extended battery (strictly in context of the RAZR's light weight ideals). It now weighs ~25grams less than the Rezound, which in imperial/US measurements is less than 1oz.
Concerning the screen: Coming from the DX to the Rezound, the colors were similar. Some people claiming the RAZR or the GNexus produces more realistic colors, but it's purely an opinion thing. Some people think the color-saturated screen is somehow realistic. The Resolution and clarity on the Rezound is the best on VZW right now, it get's wows when I show it to people.
Network wise, allow me to explain the following picture:
Click to view quoted image
Starting from the bottom up, the first three tests were done on my home wifi network as a baseline. At home I live on the very edge of a 4G service area, so my coverage is not solid 100% of the time. This isn't a radio issue, it's just literally VZW can't get decent data service in the area because of some competitor's cell towers. If you look at the VZW data coverage map, in southeastern MA there is 1 spot without coverage. It's essentially my house. So ramble aside, the next three tests were done on 4G at home. Even with poor reception the 4G speeds were on par with my home's wifi network. Finally the top two tests were done last night, approximately 15 miles deeper into the 4G territory. A buddy of mine has the RAZR, and we did side by side tests with the speed test app, on average he scored 1-2mbps slower than my Rezound in the same exact location.