From what I see on the national forums, it's LEDs with the lion's share of the lighting market (beginners to advanced setups), T5s on a majority of the high-end setups alone or combined with LEDs, and MHs coming in last, not so unlike our own community.
Personally, I prefer T5 coloration the best for SPS, MHs 2nd, and LEDs last. That being said, the combo of LEDs and T5s is my ultimate goal but I can't drop $1500 on a fixture so I'm making my own. Aesthetics isn't a concern because it'll be enclosed in a canopy anyways.
I think it's the best of both worlds, cheap, energy efficient lighting with the LEDs but with the addition of better coverage from the T5s to remove shadowing and the disco ball effect as well as covering certain peaks in lighting that aren't as really covered with most LED fixtures.
I will say just me switching out a majority of the cool white LED diodes in my fixture for warm white could almost convince me to run my LEDs by themselves as the coloration is spectacular and corrects the one thing I disliked about LEDs the most was that overly blue look but I still think having a couple of T5s in there will be helpful, mainly for coverage and tweaking color.