Dave Camarillio (a high level Judo Black belt and BJJ black belt under Ralph Gracie) said moving from Judo to BJJ is much easier than moving from BJJ to Judo, as Judo is much more dynamic and faster paced. You don't get a lot of time on the ground in Judo as you know Leo, so Judoka tend to scramble or stall as fast as they can. In BJJ you can, more or less, take as much time as you want on the ground. This generally leads to a more smooth, relaxed ground game.
"Let your food be your medicine, and your medicine be your food" Hippocrates.