honestly, whichever you like. I would say max because she would be more recognizable but if you are using the Rachel amber outfit then might as well go full Rachel honestly.
Although, it would be hard to see recognized your cosplay as one because both characters have normal clothes and have no identifying items. (Max's default is easy to spot since she wears it throughout most of the game.) I guess have a chloe (picture, person or plush) or if cosplaying as max have a fake camera around.