It keeps changing hands every week.Arsenal are on top then Chelsea and then Manchester United,back to Chelsea,then United,Chelsea,United,Chelsea,United,United,Arsenal,Chelsea ---- end of the season? I dunno.
We can talk about experience in sides until the end of the season,as gza-ob1 has pointed out and how Wenger talks about the belief and 'no room for error' but it will have to be May that decides it.