I have one AC Infinity light, a T22, which is in a 2x2 tent. They don't sell it now, but it has been a good light. It's nice to be able to control it from the phone app. Their lights are a bit expensive, IMO, but there certainly are more costly lights. All my other lights are the ViparSpectra brand. I have no complaints about them after using them for several years. The last one I bought, an XS2500, is compatible with the AC Infinity controllers.
I haven't been looking, so I'm not sure what light I'd buy today, but I'd be sure it was compatible with my controllers. I would consider one with vegetation and flowering spectrums. I'm curious about that feature because all the lights I have now are full spectrum. A detachable driver is nice to have. For a 3x3 tent, the light should be square.