20/24 to hard hits ?
2 more hitpoints? You will hit just as hard.
18/26 to be as fast as a rabbit ?
2/5th worth of an athlethic point in movement speed? Not that much.
I guess you mean for when you will reach lvl 34 if you want to be 21/24 or 18/27. You are already fast enough to maneuver effectively in ganks, but rather weak, definitely 21/24. Should've gone lower on WM and got some IF.