I used T5's in my first tank in the early 2000's. No doubt they are effective. Probably one of the most effective methods of delivering uniform coverage of light and avoiding the shadowing once the corals grow in. However, they lack the controllability and that is why a lot of people are using LEDS now. They cannot ramp up and down, and may run hotter. Unless I am mistaken, you still pretty much plug them into a timer and they will just switch on/ off. Its older technology. The LED's will give you the controllability. That said, some people will supplement their LED's with T5's.
Historically, the metal halide/ T5 combo has probably been the most proven and effective lighting option for growing SPS corals. However, many people such as myself do not want to deal with the extra heat, resulting possible need for a chiller, bulb replacements, etc. This is why I am using LED's. With that said, in my experience and from what I have seen, I think the radions are pretty much the gold standard of LED'S at this point, and have the most well documented examples of success, and the science behind them. There is a reason why a lot of the top names in the hobby, (e.g, Sanjay Joshi, Mike Paletta, and World Wide Corals, to name a few.) are using them.
I got back into the hobby in 2015 after a 10 year hiatus, and initially purchased/ set up my tank with cheaper equipment. After being out of the hobby and suddenly coming back into it, I had never heard of Ecotech radions or vortex pumps. Since upgrading all my equipment to radion lights and vortex pumps, I am beyond blown away with them. Its well worth the money in the long run.
My tank is the same 24 x 24 " as yours, so feel free to ask me any questions. I will say, with any of the single puck LED options, you WILL have problems with shadowing/ coverage when the corals grow in. Right now I am using a single radion xr30 g4 pro on the 24" x 24" cube, and there are issues with shadowing, and getting light to the corals located near the corners. The tank really could use 2 xr 30's at this point in all honesty.