I never played RSC up until the first time they re-released RSC to all members. I tried it, and the GFX were just horrible compared to RS2. But again, there's staking and unlimited trade limit. But, since I grew up playing RS2, RS2 gets my vote.
I like RSC it is better then runescape as it is now. But RS2 was Best in the first few years it was released when we had, no trade limit, wild, staking, etc
Up until recently I probably would've went with RSC, because I played through RSC when I was younger and really, really enjoyed myself.. but ever since I started back up in the last 2 months on RS2, I have to say I'm enjoying myself and I don't think I could go back. I guess I outgrew it.