I avoid UAD because it's like a virus were you can't disable their app from startup.
I still prefer developers who give options. It is handy if you have multiple systems and give you the option to archive without you having to copy an installed library.
Install managers seem to be the apps most developers tinker with. NA just seems to cause problems for some users unlike their older one.
Best Service install manager is the best. It's a zip file and doesn't stay on your system.
IK rarely updates theirs and I never have issues.
Arturia is great. You can keep their indivdual installers
I prefer those that have more end user control