I'm going to swim against the tide on the FAL forum and say PTR.
The Quality of the PTR is an excellent example of a High Quality built gun!!
The mags are THE most affordable out there. $50 will get you 50 great mags!!
I've NEVER had any failure to feed, fire or extract from either my HK91 or PTR91K in years of shooting with all sorts of ammo. Mine have feed hunting ammo with zero problems (fed 150s)
The system is simple, no gas settings to fart with or clean.
Adopted by Saudi Arabia to Norway (shows great range of operating condition that the system will function in)
Easy to Clean and with the modular butt stocks, you can switch between fixed conventional stocks or Para stocks in seconds without modification of the guns (try that with a FAL!)
Scope mounting is not perfect in either system, but I find the system is more solid using the Leapers B&T knock off with detachable rings) or you can use the HK claw for total off and on mounting.
the trigger sucks as the guns come from the factory (think of it as a extra safety when you have to pull 10 pounds to be REALLY sure you want to go "bang"! HOWEVER you can get a great trigger job from Bill Springfield for $49 including shipping which is a screaming great deal!
FAL is a fine rifle and I like mine, (wish the G-3 had a last shot hold open) but the FAL just feels so L-O-N-G compared to the G-3 systems.
BIGGER_HAMMER