Cotic RocketMAX Air or Coil?

Trying to decide if I should go for a better air shock on my Gen 4 RocketMAX or go for a coil.

Background, I've had Gen 1 with a CCDB Inline, Gen 3 & 4 with a RS Deluxe. Always felt that the rear is not as active or supple as I would like, I recently had a ride on a Chromag Lowdown, and that really shone a light on that. I've never had a Coil before, but some of the RocketMAX reviews seem to speak favourably of using a coill on this bike.

My riding areas are places like the Peaks, Golfie and the Alps.