As a Tayside instructor I am biased, and I would recommend them to you. However, realistically you would have a 2 hour drive to get to Dundee so, with weather cancellations/aircraft going tech, the nearer school is often the best bet. Leading Edge also has a presence at Perth so that could give some variety too. Tayside may be a better bet for further training as they do CPL/IR/multi but that is for the future, try LE and see how you get on. Your weight isn't really an issue, the school will determine if you need a bigger aircraft - your instructor may be tiny.