I like the Federal Mogul bearings (Sealed Power). It's just one of those things, I used that brand from day 1 and just stick with what I know works. I've never had any experience with the Clevite bearings.
You can't go wrong with either, I run the Clevitte 77 rod and Federal Mogul (full groove race) mains and have not had any issues, the M series Clev77 is a good street rod bearing, and will work fine with a cast crank.