T5 is becoming the dominate choice in SPS reef systems. One glance at any tank on the zeovit website (which is dominated by T5 reefs) will prove my comment.
The main thing that every agree's on, it's all dependent on your fixture. Some people figure they can save money by going T5 and still get the same results. This can be very untrue when you can spend just as much on a proper fixture to support SPS under T5's. This includes High output and overdriven fixtures with INDIVIDUAL reflectors.
Another big choice for people going T5 over MH is the color selections you can get from the variety of bulbs. The right selection of bulbs can make SPS look gorgeous.
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