OP: I want to go to a trail centre, which ones are best?
STW: no you don't, you should ride natural trails / go fishing / read a book instead.
I'll comment on the ones I know:
I went to Gisburn last week for the first time, really enjoyed it. Decent red loop with a bit of everything and a few techier black options. The downhill after the big climb is great and well worth repeating! I think the cafe may only be open fri, sat, sun though which is worth bearing in mind. Apparently it has improved a lot in the last year or so, so bear that in mind if you're reading old threads/reviews.
Lee Quarry is fun but shorter and more of a playground really, with lots of repeatable short runs, pump track etc. As others have mentioned it is much more exposed if the weather's bad due to no trees and being on top of a hill. The run back down to the "car park" is good fun though!
Llandegla is like a rollercoaster - fast, wide and jumpy,but all rollable and nothing really techy. Great fun IMO but some don't like it.
All good, all different...