>>51026190A. Ninetails is still my favorite in all respects. G. Rapidash isn't...horrible...but it really needed wings, should have been Fairy/Flying, and would have looked a lot more tolerable if it didn't have that dead-fish stare.
No opinion on H. Arcanine - I haven't played Arceus yet, so I have no idea how it fares in combat. Strictly speaking on its design, I find it kinda meh - its Growlithe form looked better.