Command
Generally for a non-precision approach we plan a constant descent 3 degree approach, using the DME/altitude points as a reference, aiming to hit MDA at the MAPt. From there it's either continue visually or go-around - no level flight.
The only time you would continue with level flight is for a circling approach. However you would be visual by then, otherwise it is a go-around. This has been for all the UK companies I've flown with, in both turbo-prop and 737.
Haven't done a level flight MDA since flying a light twin.