I have been looking at these too having been disappointed with my pikes.
I imagine when the manitou’s settings have been dialled in they should be extremely good forks. The damping is supposed to be very good along with the air spring. A few reliability issues from the sounds though.
The good things with the marzocchi is the 3 year guarantee and the reported plushness but again possible reliability issues (seems most forks have problems here and there these days).
I think I would try the manitous for the performance and damping technology but that three year guarantee does go a long way.