I was a Garmin only person, then between me & my MIL we both had problems w/ newer Garmin's w/in a year.
My husband had a Magellan for a while, but it wasn't great & then it went buggy.
I won a TomTom w/ LTMs & it's still going strong almost 4 yrs later. In between we went back to a used Garmin for my husband but it went bad & it wasn't even 3 yrs old. Got him a TomTom now & he likes it & it's about 2 yrs old now.
I think it's a crapshoot sometimes, but I do like my particular TomTom model the best of all of the ones we've had over the years.
If I had to buy another today, I would research between some of the more recent TomTom & Garmin models & read reviews. Probably use Amazon. I certainly wouldn't try another Magellan.
Oustide of car models, we've had several Garmin handhelds used over the last 15+ yrs for Search & Rescue, all bought used, but all great, reliable, solid & still working (though some can't be updated).