ForteXorcist is the best for tracking dots on multiple mobs.
MFClip is amazing for single target, I use both.
Thanks for the help guys/girls. I tried class timers as thats what I had used in the past, but it was overly simple compared to some of the other add-ons. I decided to go with ForteXorcist and MFClip as they seemed the best combination of single target and multidotting targeting.
Ah, I forgot to mention, a good addon for multi-dotting is DocsNameplates.
They're a little hard to set up now, but once you get it working it will show the dot durations left on every nameplate that's in your field of view. I find it immensely useful.
Started using ForteXorcist a few months ago never gone back after that, been using Platebuffs lately as well which makes it far easier what target has what duration left on what dot. (lots of whats >.<)