I preferred the older interface, but I had a lot of problems with it recently... It would take ages to delete a message, and some small stuff, but it would do the rest reasonably fast... So, currently, I am forced to use the new interface... Though it is not very bad...
I liked the old one.....but have to use and get to know this newer version so if beta is finally launched then....we will come to like or forced to like the new version.