I don't see those two in competition with each other.
WOW! I have opened Pandora's Box with this one
. On the other hand, Some interesting stuff in the banter, Guys!
Picture my scenario from a different angle, if I may. Imagine you are a Dealer who already has some new 4/4's, +4's and Roadster Trads plus some other second users in all models as well as the new Trike.
You can only have one new one, so which one of the +8 or the 3.7 Roadster would you stock in order to entice your customers to come in and hopefully buy
?
ok I'd have the +8 because in your scenario it would be a bit more distant (performance and cost?) from the others and would possibly act as a good halo model to encourage others in and to buy 
