Wow! ATX the new contender is ahead in the poll
I have both - though I haven't had ATX installed on my own site yet, I have played with it a little on my friends site and am very impressed with what I have seen of it so far
The only complaint is the price for extra licenses - its currently on special offer $250 which is a great price. But I really can't see myself paying $500 for another license when the offer runs out.