You cannot compare Morgan Trads to Caterham, Westfield etc etc etc.
IMHO the "Caterfields" are more a Mid Life Crisis or Wannabe Racer car whereas the Morgan is more an acknowledgement that you can still have a lot of driving fun whilst still retaining a very stylish outlook.
If you want to go fast, get a Caterham and go on a race track. If you want to have fun at slightly more sensible real road speeds, get a Morgan.
I think I would probably look slightly sad at my age still riding my Ducati 996. (and I'd probably kill myself if I started to ride it at anything like the speed it deserves on normal roads)
By the way, anyone under the age of 60 should probably ignore my comments.