Hi mate,
I would recommend the SMF as it is one piece, maintenance free with no moving parts and very light which changes the mass and inertia which in turn allows the engine to spin up faster.
However, due to not having any damping properties like the DMF you may potentially experience some gearbox idler chatter below 1500 rpm but a slight change to your driving style will help to eliminate that.
IMHO the increase in performance far outweighs any negatives.
However if you are paranoid about noises and do a lot of town running then perhaps DMF would be the way to go.
Plenty flys and clutch kits in stock for the DE and HR, so no drama with supply.
Alex.