Subject to final policies, Tory.
I live in a London Labour stronghold though, with a huge pollution problem so I may vote Green if there's a cats chance in hell of getting rid of the cronyist MP who's simply lined the pockets of local developers for years as far as I can work out.
I don't like all their polices but I think they are best placed to renegotiate EU membership, and they should continue the thankless task to clean up the economy probably so that Labour can change leadership in time for the next election, woo disaffected voters who will have seen below inflation pay increases for 10yrs and screw it up again.
I'd vote Red Ken back in to be Mayor of London again though. As far as I can work out Boris has spent the best part of two terms taking credit for far reaching environmental policies and programmes that he implemented. I find the idea that he might become a credible leader of the Tories, pure whimsy. He's more likely to get Graham Norton's job on the Beeb.
I won't vote for any party that shows any inclination to join forces with UKIP though there's a reasonable chance that a Tory/UKIP coalition would be the death of UKIP in the same way it has been for the Lib Dems.