wrong! I don't need 15 att IV
The Quick attack (best moveset) breakpoint (2 damage -> 3 damage) of Pidgey against Mewtwo is
8 -> 27.5
9 -> 27
15 -> 24
So if I want to power up my Pidgey to level 27.5 the attack IV does not really matter
EDIT: oops replied to wrong subtopic...
Personally the higher atk iv, the higher potential dmg u can do when u max it out. I personally waited months for a max atk iv horsea until a level 28 max hp and max atk iv seadra spawned which I evolved immediately. If the stats u list are atk/hp/def, then imo i will pick the 14atk/14hp one