In the meets I've judged in, probably 80-90% of the maneuvers people do are inside pulls which means they'll be expecting you to do inside pulls as well. IMO, mastering and applying inside and outside maneuvers equally can give you an edge. I've seen hundreds of opportunities for a cut lost because someone was apparently uncomfortable doing a push where a streamer was simply there for the taking.

Some planes don't have a symmetric airfoil though and will be looser on outside/push's. If your plane turns equally well in both directions and you can suck the other guy into an outside race, you'll easily turn inside them.