I have tried Stapleford - found it a bit too commercially oriented (not sure if you plan just PPL or CPL+)
Also used EFG, but did most of my flying at Surrey & Kent at Biggin (now taken over by EFG)
Been flying at North Weald Flying School since July last year and I've found them really helpful and professional.
The airfield is massive with a 5000ft runway and good facilities.
Would recommend them to anyone looking to learn.