I don't think there is a definitive text-book answer to this one - unless there is a step fix, you can theoretically fly straight down to MDA and continue to the MAP.
As you state, it has become fashionable to favour the CDFA because it makes the go-around easier (less trim changes) on a FW but really makes no difference to a RW.
If you have a HTA for a DA then you also should apply it for a MDA anyway - the difference will be that you can dip below a DA as you start your go-around but not a MDA.