I like the narrow Clevite or narrow ACL, for the rods, of the two I regularly use both, but like the ACL better for no good reason maybe looks LOL
For mains, Brent turned me on to coated Kings, which I like a lot, but if I don't use them, I use Clevite full groove. Not because I want full groove, but I can't seem to get any Sealed Power/FM bearing to hit clearances, and .001s aren't ever .001, especially with rods If the 125Ms would come in, they'd be my main bearing of choice.
No negative with a full groove bearing but I like the idea of a wider oil contact patch. Unfortunately clearances are more important, so it's been a while since the 125Ms worked for me
All this time I haven't tried an ACL main bearing in an FE, but the Chevy rods are nice