Haven vs Spa Mini Suite/Spa Suite

Planning a trip next summer to Alaska with my boys (26) and (20) as well as my parents (early 70's). Trying to decide if the Haven on the Bliss is worth the extra cost or should we just go for 2 separate spa mini-suites .... looks to be about an 8000 price difference currently. We stayed in the Haven on the Escape last fall and enjoyed it very much but I am wondering with the cooler weather and the pool pretty much out of play is there anything that the Haven offers on the Bliss that would be worth the extra cost. Does anyone know if there is a fast line for Haven guests for the racing cars on board?

Private dining and there was a thread about the go karts and how the suite people could prebook or something or purchase unlimited rides for about $200. The spa mini will get you into the spa and all that offers, which you would have to purchase if you just got a regular suite.