All three will give you the longevity you seek with RR and DB giving you a few years more than a straight marcite finish.

The only way RR makes sense is if you like the look and feel. If I had a gunite pool (mine is a liner pool) I would use DB over the other two for that exact reason. If I wanted a pebble type finish, it would be a PT or Wet Edge. These high aggregate finishes, with normal care, will outlast all others by a wide margin.

The normal care for all of the above finishes is the same once the finish is cured past the first month. Keeping on top of pool's chems with a good test kit will help ensure you get the most out of it's life.

Because the season is short for you, when you pull the trigger, time it for mid Spring, before the pollen season gets going or late May when the onslaught is done. This will give your finish the best opportunity to cure more fully without worrying about pollen stains setting on a fresh finish, the period where a finish is at its most vulnerable.

Scott