My boys were both very large with huge thighs. I found that nippa fastening nappies gave the greatest flexibility. Bumbles are great as the fleece lining rolls out around the legs and is nice and soft
We found that tots wraps were the only ones that didn't mark his legs, but that was a while ago and things like thirsties were not available. It is a bit a case of trial and error to find what works!
For pockets we love happy Heineys - they give a great fit on tall rise chunky thighed children