Chinese quince is Pseudocydonia sinensis.
Japanese quince usually have multiple, sinuous, vine-like trunks. Chinese quince is single trunked.
Thanks. Not sure what went wrong. And yes, it’s possible a deeper pot could have helped as in less amount of root pruning. It seemed to have thrived last year though.I wonder if you had potted it a bit deeper perhaps you would not have lost so many branches. But this new configuration does offer new design opportunities. I can still see it becoming quite attractive in a few years.