I have a 8 bulb t5 and in the process of upgrading to LED...
thought about going with MH, but a 6 foot 3 x 250W MH fixture is already ~$1500, add in ballast ~$400, 3 MH bulbs say $120 each and 4 x T5 bulbs @ $22 each
that is already ~$2500 for the whole set up.
every year to year and half another $400 for bulb changes + electricity cost
within 2-3 yrs it already pays for a $4000 LED fixture.
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