I would go with the 210. I wish my 240 was a little taller(maybe 300g if it was taller?). I just stand on a couple crates when working in the tank and drain about 10-20% of the water to do regular maintenance or to move things around. I usually wait til WC day to get it all done at once though. You'll appreciate the larger volume in the long run.
What fish are going to go into this tank?
Are you going to aquascape it?
What fish are going to go into this tank?
Are you going to aquascape it?

