I haven't demoed either of the amps you mention but did demo various Denon amps of a similar era, from memory the AVC-A1SE vs AVR-3801.
The A1SE was noticeably better but I ended up with the 3801 due to cost and priorities (music - dedicated stereo system).
I think the AVC-11SR was the next one down from the A1SR (A1SE replacement) so should be amazing.
Saying that though, the AVC-A10SE that you have probably won't be far behind as I presume its the previous model or 3 from the A11SR? It might only be a slight improvement, a bit like me going from a 3801 to a 3803.
Not sure what I would do but unless the AVC-A11SR has features you want that the AVC-A10SE lacks than you might as well put the money towards something else or save it in case the amps ever need servicing.