Domain - Soft ski, fun to play around on, low swing weight, decent pop, really fun on rails, ok on jumps, ok on groomers.
I haven't skied the retail version of the Recoil (I skied the Revival for a few runs last year and I skied a prototype of the Recoil for about a week mid-season...but I was told they changed a lot since then cause they were basically the Revival but softer). From what I've heard, the final release of the Recoil is slightly softer than the Revival (but not nearly as soft as the Domain), but this version has camber underfoot (so it's rocker, camber, rocker), which gives it a lot more pop.
Between the two...tough call, the Recoil will have more pop, but the Domain is certainly more rail oriented ski with the symmetry, zero camber, and soft flex.
I do want to note, the K2 team has been on the Recoil a lot (not exactly sure if it's for marketing purposes and they were told to ride the hell out of them...that happens a lot, or if they really like them). When a team (especially a team as stacked at the current K2 team and how park/rail/urban oriented they are) skis a ski that much, they're usually pretty good (although, that's been proven wrong in the past...afterbang...)