no its not
it depends on your goal, if your goal is to produce the most amount of bud possible then hps is for you,
but if your aiming for the highest grade and yield isn't your main concern then mh is better.
mh is closer to the suns light therfore it reacts with the plants defense mechanism and thc production is higher.
this is why outdoor is better than indoor, because the sun makes the weed more stoney
you can do this
all you want, but saying hps is better for flowering is not completely true, it depends on your goals