The R21 is a 1000 lb boat with a 31' mast, it'll see speeds in the high teens with 2 or 3 aboard in winds above 20 kts. You can take 4 to 6 people out in light air safely, if you take out large numbers of folk on either boat in bigger winds you risk breaking the boat. The 23 is larger and lighter, better top speed, subject to the same caution about big loads in high winds. The Reynolds has more below deck storage, more of a cruiser than the Stiletto. Either craft powered up will require skill to maintain control, both will require caution on a big lake when the wind is up. Both are nice boats.

Dave