Not having driven either (more's the pity as far as the +4SS goes), either my +4 (Tinkerbelle) as was, RTA, or, if you promise no cameras etc. a Europa TwinCam from the late 70's / early 80s...
Cheers,
Graham (G4FUJ)
Sold L44FOR 4/4 Giallo Fly '11 MINI Countryman Cooper D All4 '90 LR 90 SW