If you are that close why don't you go and visit them both?
We were discussing the commercial training on this thread not PPL.
I don't have a clue what multiflight are like for PPL.
There are alot of yorkshire pilots in the Private Flying forum who would give you a much better review of PPL training at the airport. As for PPL at LFS I am sure it is the same high standard as the rest of there training.
But LBA is not know for nice wx and there are so many great GA airfields within driving distance of Leeds. Sherburn comes to mind.
Good luck
MJ