There are so many considerations - weight, length, caliber, parts availability, and so on.
I guess the right question would be to ask is which one would you grab out of your safe if you were on foot and could only take one gun? (and maybe a pistol or two)
For me, I like my SKS, but the round is kinda short for anything beyond 100 yds.
I would prefer to take the FAL or the M1A, leaning toward the M1A, but both are pretty heave to haul around for days out in the field. And the ammo isn't light either. But if they hit, they put down. Not like the little mouse guns.