Well I think you have to do what you enjoy. I think pattern and 3d can be equaly challenging. For example, I have seen good pilots fly 3d in freestyle competitions and it is amazing. Every 3d manuver is performend gracefully and with precision. It is often mixed with smooth imac manuvers too. On the other hand, some pilots get a kick out of burring holes in the sky. just doing the wildiest things they can imagine. and banging the sticks.
just find what you like and have fun doing it! [8D]