Downsizing help me decide

I am looking to downsize from my 90 gallon tank to something smaller. The maintenance is a little too high, so is the tank height (24" is too tall for my arms). Also, it's in my basement dungeon where nobody enjoys. What a disaster.

I will be keeping either my 4 x T5HO, or 6 x T5HO TEK fixture. The tank will be SPS dominant (I don't think all my existing corals will fit) and I will incorporate my sump into it and re-utilize all my existing equipment.

My choices are either a 40 Gallon Long (48" long x 12" wide x 16" tall) or a 55 Gallon (48" long x 13" Wide x 21" tall). Which would you go with and why?

I have a preference for the 40 gallon long but am unsure on whether the lights will be overkill. I am using the TEK legs so raising the fixture up is limited to a certain height.