Well, both types have their drawbacks. The subject has been beaten to death though. Maybe MatterofFact should read one of the LCD vs Plasma threads.
Here goes anyway:
Depends on what your usage will be, and just as importantly, which drawbacks bother you more. And I do have a plasma as well in my study.
Plasma image retention is *not* a thing of the past, although it's relatively minor now. Burn-in is nearly non-existent with basic precautions. But you wouldn't want to fall asleep with, say a browser page up or leave on a channel with a prominent logo. They're dimmer, certainly, and whites aren't as true, so if most of your viewing is in a well-lit room, plasma picture quality advantage is much reduced. I personally am sensitive to flicker and dot crawl, though not nearly as much as some people.
Edge-lit LED/LCD is prone to non-uniformity. It's most noticeable on an inactive input, and should not be noticeable viewing normal content. With the exception perhaps of dim scenes, though you'd have to be looking for it. If it *is* easily noticeable in normal viewing, I'd call that a defect. Motion is not as good as plasma, generally, and viewing angles are narrower. Blacks and contrast will not be as good as even a cheap plasma, except for the discontinued Sharp Elite ($). Again, the difference is less if most of your viewing is *not* in a darkened room.
So here it comes: Have a look at both types, if possible, and consider your viewing conditions.
I confess that if anyone made a 70" plasma, I might have gotten that instead of the Sharp. But again, I'm pleased with mine.