some say that mh produces a better tasting final product when used all the way through the flower cycle...
but some say hps will yield more compact buds, and better dry weight, and finish a little faster but at a sacrifice in taste.
its all a matter of preference.
personally i go quality over quantity every time so when i use hid, i use MH, and supplement with some 3100k 46w cfl's.
im also noticing that in my few pure cfl grows, the final cured product has been best vs the ones grown with hid. this could be strain related, and as well the cfl's take a long time to finish the sativa heavy strains I prefer.
So lately im rebuilding my setup to do a dual 400w mh with supplemental cfl lighting, sog style. lol hopefullt it works out right, ive invested alot of time and planning trying to do this as cheap as possible, yet get the highest quality final product.