I went with IDIDIT because their catalog listing was clear & accurate and they offer tilt-column replacement kits for the early Novas. No having to worry about correct length or wiring harness plugs was a big plus also.
I'm very impressed with my IDIDIT column. I don't have any data that it's any better/worse for Flaming River, but the difference for me had to do with the info they presented in their catalogs. Made a world of difference and lead me to choose IDIDIT.
I have Ididit, but you can't go wrong with either one. Flaming River makes direct replacement for Nova's as well in their catalog. I've used some other Flaming River components and they are high quality as well.