First of all, congratulations on your good judgement; both are excellent. I have (or have had) 3 SA-85Ms and probably 8-10 MAKs (stamped and milled) and they're both excellent shooters...when added to the Bulgarian SA-93 and FAG (not CAI) AMD-65s...are the absolute best working AKs you can get in the US.
The MAK represents better value (chaeper, generally) than the SA-85, and more plentiful. However if the several-hundred $ price difference is not that big a deal for you, I recommend the FEG. Be aware, CAI has recently offered a knockoff of a Hungarian. Good on them for helping AKs into the American market, but I'd generally stay away from Century products, especially if you're going to have only 1-2 AKs.
The main differences have already been chronicled here, but to summarize...
Muzzle
- stamped MAKs have muzzles that are turned down too much for standard AK muzzle devices (AR-sized can work, however). SA-85s are cuttable to AK 14x1 LH. Note: make milled MAKs have enough steel to support an AK thread.
Receiver rear
Some stamped MAKs (and as far as I know all milled MAKs) have the stupid angle-cut at the rear of the receiver, making it very limiting for buttstock options. Not so at all with FEGs
Receiver thickness
MAKs are thicker, creating some limitations on receiver adapters. FEGs are standard thickness.
Availability
MAKs are everywhere; FEGs not so much.
You can't go wrong with either.
Have fun; good hunting.