Hi Tom,
I went from a 2015 3 wheeler to a new 4/4 late last year.
The 3 wheeler is so dramatic, a real head turner. To be fair the 4/4 doesn't have quite the "wow" factor - i guess its more of a real car in that respect.
The plus 4 would be more practical but bear in mind the hoods are not waterproof as a new MX5 would be and i prefer the 4/4 without side-screens. The heater is nice and it does feel are more grown up car. It would be equally fun to drive as the 3 wheeler however minus the lovely exhaust noise of the V twin.
The other thing is that the plus 4 is likely to be cheaper/easy to maintain and dare i say more reliable? My 4/4 feels a better built car to me.
Its one of those decisions you'll have to go with your gut feeling. I do miss my 3 wheeler very much but wouldn't go back!
