I prefer AMOLED if:
-its a high quality unit from Samsung instead of the usual second rate stuff they sell to other OEMs
-the display is calibrated to have a reasonable amount of saturation without completely throwing color accuracy out the window
-it hasnt began to degrade and/or burn in.
I've used AMOLED before with two Moto X 2013 and two Nexus 6.
The Moto X 2013 had a pretty good display. It was 720p but the PPI was there. I didn't really have any complaints about it. I ended up breaking my first one (oops) and the second refurb had obvious signs of display wear with the on screen buttons and notifications tabs burning in after a week of use. Other than that it was a great little display, especially for what was a mid range phone. I don't really have anything bad to say about it.
The Nexus 6's screen was horrible and was a big reason why I got my HTC 10 as soon as possible. On both of my phones (sent the first one back to USB port failure) the display was extremely warm. If I had to guess the color temperature was around 3400k which looks like someone relieved themselves on the phone. This combined with its typical low quality AMOLED screen being oversaturated just made it miserable to use. The only good thing that I can say about the screen is that it had true blacks.
My HTC 10 does the job even though its a pretty dim display. Obviously it doesn't have true blacks like AMOLED but it comes pretty darn close and I have no frustrations watching darker films or watching Netflix at night. Along with that, contrast is also great especially if you keep it on the more fun and appealing Vivid mode instead of color accuracy freak sRGB mode. I also really like the built in software feature to change color temperature. The coldest setting doesn't get close enough to my preferred ~6500K but its better than nothing.
I would love to return back to a high quality AMOLED display but i've been let down by the Nexus 6 so hard that I rather stick with IPS, Super LCD, whatever... until I get over my Samsung biases or other OEMs start to have good AMOLED screens.