as far as simplicity goes, the LS/VTEC conversion is a lot easier than doing a H22A swap. The only hard part is drilling and tapping the block. Its really not a big deal though. If you plan on swapping in a H22A, you will have to do a lot of stuff. Also its a pain in the ass to keep A/C and P/S with the H22A. It can be done, its just not easy.

h2b info

http://www.quartersportsdrag.com/H2B.html