I have the same problem with LED lighting. I believe it's because it more of a point source/directional light meaning that the underside (unfortunately for me to, the side I look at) gets no light and goes pale.
T5 is a linear light, so it hits more of your rock work and corals. I have run t5 in the past and without starting another t5 vs LED poll, found that's coral colonies grew a lot more uniform and also the bottoms of colonies didn't die off as much as they got more light.
93 cube is a tough one to find t5 fixtures for. The ATI sunpower/powermodule in the 24" length seems to work, but your going to want an 8 bulb fixture so get ready with your $$$$.
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