I had a Rotel 971(not a 991 but same vintage) and then went to the 1072. The 1072 is much better everywhere. More detail, more extension at both ends, blacker blacks, etc...
Having said that. I sold the 1072 and bought a Marantz 8260 for almost the same price. It was a HUGE step up.
If you are set on a Rotel, get the 1072. If you're looking for the best player for your money, there are others out there.