I just demo’ed them both, very different, oddly enough.
The IK sounds a lot cleaner, and gives you a lot more leslie options and controls.
The Arturia sounds a bit dirtier, have built in ‘room’ enviornments (warehouse, studio, etc) but has less leslie options and controls.
I liked the interface on the IK more.
Will do some research a bit more and listen to others and await a sale.