The tonneau is the singularly most useful of any extras on a conventional 9 stud or 10 as mine is windscreen - but know nothing of the easyup's arrangements.
All three Morgans I have had custody of have had conventional stud roofs by choice. You don't get that bulge at the rear over your shoulder that I dislike. The trade of is it doesn't take you 3 minutes to get the roof up, I don't mind that as I discovered at an early age that I was waterproof
Have fun choosing your bits and enjoy it when you get delivery.
p.s. I have an everflex and a mohair one - the everflex is for everyday use and the mohair is for dressing up days , it also has a zip cover sewn in which is vital otherwise water comes through the zip.