Whatever gives me a hassle free build with as little stress as possible.
As my eyesight has deteriorated detail just isn't important anymore. I hate having to shim or file every piece, or have a 20 piece assembly when 2 would have been sufficient.
If I went with pure numbers in the stash, the leader would be Historex, as for numbers built it'd be Airfix. But every company has their good and bad. It's really a kit by kit basis.
I even found myself liking an Alan kit once and there is a definite satisfaction to having wrestled with a kit and won.