I don’t get the ones that have different end caps for both ends and require no re-dish – surely the drive side has to stay at the same spacing from the dropout to keep the gears working so you either re-dish or put up with a non-centred rim ??
That’s not the whole story though. If you have to pay someone to do the re-dish (i.e. not confident to do it yourself) then that reduces the price difference. Also with the MRP you can quickly revert the wheel back to non-boost, say when you use your spare set of forks while the main ones are serviced.