Just bought a PTR91 myself and have been very happy. Don't own an M1A, so I can't compare. Do own an FAL, and the PTR91 definitely has more of a kick. Personally, I like the balance of the FAL better. But I would say the PTR91 is more accurate and definitely has better sights.
One word of warning on the PTR91, the trigger is very heavy. I'm right handed and left eye dominant so I shoot left handed. Always have. After 30-40 rounds my finger literally starts cramping. It's all I can do to pull the trigger. This wouldn't be quite as much of a problem if I was using my dominant hand, but still the trigger is very heavy.
Of course there are solutions to this problem, and I'm actually sending out trigger pack for a trigger job. Once the trigger work is done and I've got an optic mounted on this baby, it's going to be awesome.