Well, let's see...

Silvertone-

Never had one that had a good picture. Always had fuzzy video for some reason. I'm referring to the rectangular-screen tube-type color sets of the late 60s/early 70s.

Motorola Quasar/Quasar II-

Works great, when the modules all make good electrical contact, that is.

Philco-

Predictas and other "Cool Chassis" sets are too hard to work on and have CRT problems.

I seemed to have the most luck with Zeniths (tube-type). Often, I'd bring one home out of the garbage and it would work perfectly without any work being done to it. Most of what I found those days were tube-type rectangular CRT Silvertones, Zeniths, a few RCAs, and a Japanese set every now and then. Those are the sets I had experience with at the time.

As for GE... it's a mixed bag for me. I'm currently working on a KC chassis (1967) that basically works, but has a lot of off-value resistors in it. I had a HB mini-color set years ago that had a weird chroma problem I never figured out. I probably could have fixed it now, but I knew far less about electronics twenty years ago. When a GE works, it works good, but they can be tough to figure out when they don't. One thing GE did, though, was use a lot of engineering shortcuts such as no 3.58mHz oscillator in their color sets or some sets that did not use a HV regulator.