Mix.
But I only like the monti caps for SPS. I just like the structure of them, plates and vases. My 400 will be a mix with the SPS being Monti Caps of various colors. You can't beat the movement of the LPS, frogspawns, bubbles, torches, hammers. I also like to have a few clams along with Zoas and shrooms as fillers between the larger corals.