Dragoon is still very fun. Reaper suffers from lack of abilities to do at lower levels. The kit comes together at higher levels and feels good. Dragoon doesn't have that issue once we get to lv 60, 70, and 80 because they have a lot more oGCD actions to weave around. The gameplay smooths out much quicker. Different APM for 2 jobs, and different focuses.
Personally, I'd choose Reaper because I am more aesthetically inclined to their Lv 90 Gear (and they have a working HAT on Hrothgar no less!). I'm just a bit disappointed from losing the Blood of the Dragoon blue aura animation. However, Dragoon is still a close second because the gameplay is still fun.