I'd say it would depend on what you are going to do with it.
I don't think I can add more than what was added in that thread. The only other AK74SU to look at would perhaps be a Bolt, They have a standard and tactical variant. Both have the Blowback feature, and it's a different blowback to most guns running on the piston rather than a compressed air leach system. The only real disadvantage is both variants are forward wired with the battery sitting in the fore grip, so they only fit small batteries and not the big sticks that most AK's use.
https://gunfire.com/en/products/aksu74-b-r-s-s-assault-rifle-replica-1152222694.html
https://gunfire.com/en/products/aksu74-tac-b-r-s-s-carbine-replica-1152226152.html
The only way to get a better variant over that is either a Daytona conversion, or GBB variant.
I don't think I can add more than what was added in that thread. The only other AK74SU to look at would perhaps be a Bolt, They have a standard and tactical variant. Both have the Blowback feature, and it's a different blowback to most guns running on the piston rather than a compressed air leach system. The only real disadvantage is both variants are forward wired with the battery sitting in the fore grip, so they only fit small batteries and not the big sticks that most AK's use.
https://gunfire.com/en/products/aksu74-b-r-s-s-assault-rifle-replica-1152222694.html
https://gunfire.com/en/products/aksu74-tac-b-r-s-s-carbine-replica-1152226152.html
The only way to get a better variant over that is either a Daytona conversion, or GBB variant.
they're close enough to RS spec for handguards and the like (repro parts are a few mm too short)
otherwise mostly summed up my thoughts on the 2 brands here: