I use the swim platform on our R-25 way too much to be willing to give it up to the dinghy lift. And between blocking the solar panel, damaging the dinghy on sharp edges, being an absolute bear to deploy/store, and biting away at fuel economy, I abandoned the attempt at storing a dinghy on the roof.
I just picked up this TrueKit Navigator 2.5 (
https://truekit.us/products/true-kit-navigator) at the boat show that is stored in the center cockpit locker. Can't speak to performance as I haven't had the chance to putt around in it, but we just use it with an electric motor to get to shore or mess around the marinas, so all I need is for it to stay afloat.
I had another inflatable dinghy previously using the same setup but it was nearly 100 lbs all said and done and a massive pain to pull out and put away. This TrueKit is worth the cost solely due to the low weight and small volume it takes up. I compared every dinghy I could possibly look at for weight, assembled size, and packed volume and this one beat every other option, disregarding price.