between the two, I'd rather be superskinny. I'm watching my husband battle with weight at the moment, and he needs a lot of care. I wash him, help him to the toilet etc. and it is degrading to him. He's doing well with the weight loss but has a long way to go still.
I myself have lost just over 4 stone, and I know how hard it is to shift weight.
Being either extreme isn't great, but out of the two, I think I'd cope better with being underweight than overweight. You don't need to worry about whether or not you'll break a chair / whether you can fasten a seatbelt / whether or not you can fit in a bath / whether or not you can physically reach all parts of yourself to be able to wash .....
there are a HELL of a lot of mobility problems caused by being obese, and far less by being underweight.