I’ve got the new mk2 diablo and the medium setting on the diablo is similar to the high setting on the joystick. 300 lumens is enough for road riding, however with a diablo you do have that extra power if you need it, which you will if doing anything quite technical off road. The high setting on the diablo is similar to the high setting on a Hope 4, its very bright. For a few more £££ I’d get the diablo.
There is another exposure light for the road, cant remember its name but it only has a main beam and dip setting, think its 600 lumen max and 300 lumen dip. Maybe this would be better for you?