A lot of it is personal preference! I have done all the mods, hack, tweaks, and when it comes down to it no Dev has any proof that there Rom is better, or faster than the next, other than the pretty BS that they build into them! Flipzmode did a benchmark to all the Roms out and even included 1.5 and guess what it was right in there with the other and even beat the others in some category's.
So basically the only difference is a lot of those Roms is they now have live wallpapers running, which again to me is more of a gimmick than anything!
So again for me to do the 2.1 RUU I just wanted something that worked 100% of the time, without all the BS that Dev put into it! Being the Rom comes rooted I can still do most rooted thing and download apps made for rooted phones.
Anything else you need just ask!
Edit:
Here is the page to the benchmark!
[Benchmark] Sprint 2.20.651.1 Based Roms - xda-developers