I've always wanted to fly a Cap 10 - being a side-by-side is probably great for receiving instruction as compared with a tandem configuration, although I have no complaints regarding the latter. It is also a superb looking aircraft - if only it wasn't so expensive (I am sure any owner will of course say that you get what you pay for...). FNG is right, the elliptical wing is gorgeous.
As regards whether a more complex aircraft is better or worse in which to learn the basics, well, think about how many figures / maneouvres you can fly per hour. Spinning for example - the more powerful the aircraft, the faster you can climb to the height you will learn at, the faster you can regain height to that point etc. End result - much more aerobatic flying per hour. Doesn't really matter whether Pitts, Cap, Yak etc. You just "waste" less time gaining / regaining height.
So on a £££ per maneouvre basis, you may just end up coming out ahead...