If you have Fatsia on one of your teams, it won't matter, since the eventual TP increase would be the same.
I personally split the ampies between high ATK-buff girls and Counter-girls though. ATK-buff girls got ATK ampies, while the counter ones got tyhe HP and DEF ampies. Waifu Acacia is going to be the first to receive the full treatment (after I finished Helenium for DEF and HP ampies).