I've had a couple of flap equipped sailplanes. I really can't say the reflex was better than a simple wing with a good L/D airfoil. And I've had more than one servo trashed. Even on a wing it looked like it shouldn't have.
I've had and have a number of spoiler equipped sailplanes. My experience is spoilers are the best and safest help getting down out of heavy lift. They are good help getting close to the pin on landings. If I had to choose, the choice would be spoilers.