Fast rolling light weight all-rounder… I would go for the bonty chapucra. Super light weight carcass and very fast rolling. Not great on mud mind you.
On my xc semi fat I run two Chupacabra’s at about 14psi. On my more trail orientated semi fat I run the vee bulldozers which come up a tad wider than the 3″ (sold as 3.25″).
The minion is also a great tyre but heavy… Perfect for more aggressive stuff.
I also have another frankenbike running an ikon 2.35 on the 50mm wide rims… Carcass shape is flattened a bit but works perfectly. This one has a plus wheel up front (again with the bonty tyre).
I reckon you would be best to go for a 3″ if you are used to fatbiking. Volume really helps and it the whole point of the plus size so make use of it.