Well... and it's a personal view...
Around the time I had the Avon Rover 3.1m I also owned a Honwave 3.5 alloy floor which in many ways would be a similar concept/design/construction to your Excel... and there was about 400mm between their sizes as there is with yours.
The Honwave felt far more grown up, more roomy and stable with a far drier ride... so as a boat to value for its abilities it would have been the Honwave for me... i.e. the Excel for you.
But if you find the Avon's performance equal for your use I'd keep the Avon for its classic elements and strong Hypalon build.