The Fuji or the Rollei, depending on availability. The Rollei has had issues with leaky packages and developer parts DOA, but it's easier (in the EU anyway) to buy the Rollei components separately in small (i.e. 100mL and 1L, not 20L) quantities. I think the Fuji costs more, the Rollei has slightly higher dev capacity in the kit and the Fuji has twice the bleach/fix capacity in the kit.
This is what they have available at Freestyle (great place to shop):