I think V18 is better simply because of the newest functions and tools. Multi-Thread rendering alone is worth it. Purge is sweet. Multi Add - Wow plus much more that makes working easier. There are still a couple things that need attention in a patch that I hope comes soon, but other than that I think it is great. I find it very stable and plan to do all my work in V18. This is the first version in a few that I feel confident to move all work too. I agree that V11 was awesome, but I haven't felt a need to go back to it since v14 came out. I have no qualms about recommending v18.