M1A.
I've owned an FAL, and traded it ofr an M1A after spending an afternoon shooting them side by side.
The M1A IMO is more ergonomic, has better sites, recoils less, points more naturaly, has better balance, is lighter (at least it seems that way to me), and is more accurate.
Even reliablity wise, I've seen both have malfunctions. But have seen FAL's jam more often.
To me the only plus on the FAL are cheap mags.
For me in a .308 battle rifle, I'll take the M1A and bite the bullet on mags.