Stock disc Prop valve vs adj prop valve with drum distribution block

title says most of it

Converting from drum to K/H front disc brakes

If using the stock drum distribution block, all I reall need to add to the system is an aftermarket adjustable proportioning valve correct? Gives the option of switching to 4 wheel discs later. $40-$50 new

Or go with stock style prop valve $90 new

Which should be your preference.