I like the t5 lighting myself.
The watts dont really equate to each other in my opinion. You could have a top of the line t5 setup with individual reflectors and great bulbs that can put perform a metal halide of the same wattage.
I was using a 150watt clip on MH
fixture and much prefer the 96 watts of T5 lighting I now use.
What size tank are you trying to light and what are you wanting to keep under the light?