Pound-for-pound you really can't take anything away from the Montipora Digitata, as a first run coral. I've had a green one for the better part of twelve years, which has done everything from recede, grow, not grow, bright colors, muted colors, due to varying tank conditions.
It has grown under VHO, T5, MHs......two-part, CaRx, and two months where saturated kalk as part of my top off system provided for Ca/Alk. Two years ago my stand-alone display experienced an RTN and a 8" colony died off to just the original frag I received (that was weird)......it then grew back to full colony size, which I sold to a LFS. While breaking down my display tank and frag tank, into the holding tank I have running right now due to our home renovations, I found a finger nail size portion which was growing on the underside of a piece of LR.......six months later its doubled in size in a 55g with 3 T5s.
Ya, they're hardy little corals.....slimers too, but I never liked the growth pattern of slimers. Mine looked out of place for the dimensions of my 100 I had running.
Good luck.