I think the advice you've already been given above is pretty accurate. I just thought I'd add a bit about my personal experience. I have a 120 dominated by LPS. I started with a 4 bulb T5. I really liked the light, but didn't want to have to keep up with the bulbs, and it was hot for the space I had available. I also didn't like that I couldn't personalize the intensity/timing as much as I wanted. I moved to a 48" photon series ReefBreeder. Immediatly, I dropped the fixture in my tank (when mounting it), and soaked the controller. The customer service at ReefBreeders is outstanding, and I would definitely buy their products again. As far as the light goes, I'm very happy with it. However, the 48" is probably overkill for my tank. I would have been fine with the 32" and the wider optics.
On my daughter's 29gal cube, I'm running one of the small Kessil LED's. It's actually my favorite of the three lights I've tried. The small one isn't controllable, but their bigger fixtures have independent controls for blue and white channels that work with most controllers (I think). I'm also convinced the Kessils do a better job of replicating the look of a metal halide than my ReefBreeder.
Personally, if I had it to do over again, for my 48" tank, I would buy 2-3 of the large Kessil fixtures and control them with my Apex. The downside to that of course is that it's not a particularly cheap solution. The upside is that their are no bulbs to replace, very little heat generated, and I could control color/intensity at different points along the length of the tank independently.
That's just my two cents. Hope it helps. Good luck with your decision, and keep asking questions.
Chris