His ISO is also inflated by his home park, where he has .875 OPS and 50 homers compared to a .753 OPS and 38 homers away in roughly the same amount of games. Even still, Joc Pederson had a .273 ISO last season whilst playing half his games in one of the best pitchers parks in the game.
So again, when adjusting for park and league, it's likely a 5-10 homer difference. Pederson also is better defensively and better on the basepaths. He does have issues hitting lefties, but Gallo isn't exactly amazing either. And with 350 career at bats against lefties, we run into sample size issues as well.
Bored, so I'll play:
Get them both, trade Inciarte, play Acuna in RF, keep Pache and Waters so in a couple of years one of them takes over CF (ideally). Use Inciarte to bring back prospects. Trade for Gray and Frazier from Yankees.
Teheran & Bryse Wilson for Pedersen & Homer Bailey (assumes Dodgers get Harper and want to move payroll)
Newcomb, Fried & Cruz for Gallo & Mike Minor
Gohara, Allard & Wentz for Gray & Frazier (assumes NY signs Machado and wants to move Gray)
Inciarte, Jenista to Cleveland for Kipnis, Nolan Jones and Ethan Hankins
Moves result in Braves net add of ~$25M in payroll
End up with:
RF Acuna
2B Albies
1B Freeman
3B Donaldson
LF Gallo
CF Pedersen
SS Swanson
C McCann
Bench: C Flowers, Util Camargo, Util Culberson, Util Kipnis, OF Frazier
SP: Folty, Gausman, Gray, Minor, Bailey/Soroka
RP: Viz, Minter, O'Day, Venters, Biddle, Winkler, Carle/Sobotka