Option A
Pros - Cheap class (£4 for 1 hr), caters for all 3 of my dc within the same class (ages 3-13), close to home, also does ballet/cheerleading/street dance etc if they wanted to switch to any of those.
Cons - Doesn't seem to involve membership to any sort of gymmastics association, doesn't have its own premises, my 10yo was the oldest by a long way and so I don't know how much she will get out of it (she is my keenest gymnast).
Option B
Pros - Comes with many recommendations. My 10yo has a friend who already goes there. Age 8-18. Own premises.
Cons - Comparatively extortionate! £18 for 2 hours, plus extra for British Gymnastics membership (incl insurance etc.) A pain to get to.
If it weren't for the price, Option B would win hands-down for me, but is the extra cost really worth it? They had a trial at Option A yesterday and, whilst they enjoyed it, it didn't seem very 'official'...