Having driven both setups albeit on a plus 8 (mulberry) and plus 4 tourer sport (Suplex) I would say the following. If you want to tour and have as comfortable ride as you can in a Morgan then it's Suplex with rear ended set up to match, the rear end has a significant impact on the front, ask Aeroman. I set up my Plus 8 with a Mulbery front and rear end and AVOs and it was great a little stiff but great if you were and aggressive, trac day or fun run hill climb chap. With respect to steering dampers be very careful as to and what you fit if they are not right then they can impeded the steering movement at particular lock positions and could be dangerous. I had my steering adjusted by Nine Elms on the +8 to ensure the track rods were as parallel to each other as possible and this removed any wobble and steering was as light as can be expected on a+8. Hope this helps.
