There are those who will say that you should be using the MH. I am a cheap woman and I haven't had the heart to hit my husband with a massive power bill trying to grow a plant that grows best in full, direct sunlight. I personally think that even shop lights are fine, and in fact those are what I use for vegging, I simply mix the bulbs as best I can and acclimate when putting under HID or sunlight.
So, for *me* the question is this--sure, maybe it can be better, but how much better? Is it worth it? I am always thinking in terms of return on investment. In other words, my mantra is different from that of many growers who insist on "nothing but the best for my girls!" My thinking is more along the lines of "will this accomplish the goal?"
That means that if, for you using MH is doing it better, then go for it. But not while you're trying to get plants rooted. :)