Les:
Your question has kind of a complicated answer, so bear with me here, okay?
If one is talking about late-1940s/early-1950s ranges, I don't really have a preference between GE and Frigidaire; both companies made products with very similar features. And styling was roughly equivalent in quality during that time frame.
Later, in the late '50s, I appreciated GE's Straight-Line Design styling more than I did the equivalent Frigidaire Sheer Look styling. This is strictly a matter of personal taste, but I always felt that Frigidaire slightly over-did the glamour when styling their higher-end appliances. GE's styling was also glamorous, don't get me wrong, but it was - for my money - a glamour that was a wee bit more tasteful.
So far as my preference on a daily driver, it's for a GE with P*7 self-cleaning, introduced in 1963. Frigidaire responded in '65 or '66 with Electriclean (one of our Frigidaire mavens could supply the correct year), but again, GE had the styling I found the most attractive - to say nothing of windowed oven doors, which Frigidaire didn't have on Electriclean models until the '70s.
The other reason I prefer GE is that GEs - for the moment - have better parts availability on the '60s and '70s models I prefer. That may change now that Electrolux is involved, but for the moment, it seems easier to keep a GE range in good repair than it does a GM-built Frigidaire, because when WCI (now Electrolux, which should explain my concern with future availability of GE parts) bought Frigidaire, they changed a lot of GM-engineered design and parts availability for GM-built units is a little spotty. Stuff like burner supports, for instance, which GEs don't even use, because the GE support is part of the Calrod element.
So, I like an easy-to-repair driver, and I like GEs styling of their self-cleaning ranges.
But that's just me, and I know plenty of people, like Phil philr, who love Frigidaires and would never "turn on" to a GE range in the same way.
I told you it was going to be a long answer, LOL.