Good grief, this isn't a .223, and shouldn't be expected to recoil like one. The triggers aren't glassy smooth, but then again this isn't a super sniper, bench master, 1/4 moa rifle. This is a full power battle rifle with excellent accuracy and incredible durability and reliability. Ease of takedown is second to none, I can have mine apart in less than 4 seconds.
I've shot all but the FAL, and using identical ammo with rifles of comparable weight (all around 9.5lbs) I find the M1A and AR-10 (technically a DPMS LR-308) to have much lighter recoil than the PTR-91. I hated the sudden jerk of PTR-91 recoil, while not as heavy as a 12ga shotgun it was just as unpleasant. I think the shape of the buttstock and the low sights made it worse.
FWIW, the PTR-91 I had, which I bought brand new, could hardly put 5 rounds into 4" at 25 yards (i.e. 16 MOA). In comparison, the first time I shot an M1A, on the exact same range, I put 10 rounds into 1" at the same 25 yards without even trying hard. Sure, I've read of PTR's that supposedly do sub 2 MOA, but it wasn't my experience. This was all using quality, recent production, brass cased ammo.
As for field stripping, the FAL is tops for routine maintenance, with the AR-10 very close behind. The PTR-91/G3 is easy to take apart, but can be very difficult and tricky to reassemble without a special tool. The M1A is nearly as fast and easy to take apart as the other three. Really, they are so close together it's a non-issue, apart from the potentially difficult reassembly of the PTR bolt group.
Of the other three, I don't think there is a clear best, though it seems that:
-the FAL is most liked by ex-military types other than those who used an M14 in the US military;
-the M1A is most liked by people coming from a sporting/hunting background and by a lot of people who shoot competition;
-the AR-10 doesn't generate the same love that the others do, but reports of sub-MOA groups from AR .308 types (in particular, but not only, the DPMS LR-308) arrive with boring regularity. The LR-308 is probably the cheapest highly accurate semiauto rifle you can find in .308.
My thoughts? For all-around use, I would get an FAL, closely followed by an M1A. For casual competition (DCM/CMP but not at the highest levels) and some hunting, I would choose M1A. For long range precision shooting and competition classes where it's allowed, I would choose a .308 AR due to its higher accuracy potential and highest accuracy at any given price point. As for the G3/PTR, I would rather have an AK or SKS, not to mention any of the other three "battle rifles".
One other comment: just a few years ago, cost and availability of standard capacity (20rd) magazines was a big issue, with the FAL having a huge advantage, followed by the PTR. This has since changed dramatically, with FAL mags becoming more scarce and expensive, and brand new, quality US-made mags for the M1A and .308 AR types being available at quite reasonable prices ($21.50 for M14 mags, $15-20 for CP LR-308 mags, $27-35 for Armalite brand mags for the Armalite Inc. AR-10).