The comment about getting on with your instructor is on the money. Find someone who you really enjoy flying with. If you don't get on with your instructor change to another one *immediately*. During my training I had the misfortune to be landed with an hour-builder who just didn't care and was constantly critical. I gave up as a result. 6 months later I was persuaded to have another go. Happily, I then found a super instructor and I never looked back. We spent so much time laughing in the cockpit I think I can fondly remember every single mistake I made when I was training.
You'll get two very different types of flying at East Mids versus Derby. With Landing LDAs of 2715m (R27) and 306m (R23) respectively, I suspect you'll probably go solo a bit quicker at EMA - but if you can land in no wind at Derby, then you'll be able to land anywhere. Great little airfield and you can get your aircraft maintained there if you end up buying something.