Hi,
The light features really depend on what is in your tank.
First and foremost, if it's fish only, softies, mixed reef or fancy stony corals.
I have a mixed reef, mostly softies, and fish. Started with t5's and tank did well, but I wanted the simmer of LEDs. So I added a cheap $100 eBay strip. After upgrading to my 125, 6 foot long tank, I was in need of new lights.
Most high dollar lights grow stony corals and are for very serious hobbiests. You really need to read about spectrum and par and lux values to buy a light which combines budget, need and wants.
I started looking into cheap eBay black boxes, then realized needs of corals, and gave a hard look at ocean revive lights. However they are not ramping (program to feature sunrise/sunset), and have no moonlights.
Next are the SBreeflights, these have it all, with a good spectrum and wifi programmability, which works well. Does the fancy sunrise, high mid day, slow ramp down really affect corals? I don't know, I think you can do this like I did with my old tank, and simply turn on a few lights with cheap digital timers, but it sure looks cool when you are controlling the tank from your IPad!
Establish a budget, determine need, then see if there is room left for fancy gimmicks. I did this, and found a smoking deal through lots of research.