What LED light and controller has the best glow and smoothest fade?

I’ve noticed that many LED lights I’ve used don’t have the best fade up. Not an expert but I assume that has something to do with the controller and the quality of the LED itself.

Have you used a setup that you have noticed to have a very good glow and fade? I know that these terms are vague and subjective but I’m using them to get human and subjective answers. I’m looking for an LED setup of any kind that has made you go “oh, that’s nice!”