I'm growing Fissidens F., Peacock moss, a few Vesicularia spieces, taxiphillum peacock and flame, Riccardia chamedryfolia and fontanilis A. and few others unknown.. All can grow on rocks.
The most difficult of them is the Ricardia which actualy also grows in low light very slow as well as in high light relative fast. But attaches rather bad..
IMHO all do good in any kind of light.. Depends on your skills the keep algae out, because all of them are algae magnets in high light. Fissidens does best in high light and likes co2 to becomme realy beautifull and larger in leaves. The rest isn't that picky at all.
Vesicularia can be very invasive can be picky when it comes to attaching, needs a lot of care and pruning in higher light and co2.
Taxiphylum peakock is very beautifull in structure and color and easily grows out of the tank when put near the surface. And very easily attaches also to to rock a good creep.
T. Flame doesn't realy creep grows more up in long strains..
Fontanilis also can grow fast into dense bushes.
Suggestion?? Hard to say, it's what you want and you like and find beatifull. I would prefer Peakock and fisidens for rocks..
Solenostoma tetragonum also sold as Blepharostoma trichophyllum is a stunningly beautifull moss.. Very slow but a beauty and expensive.
I had a tiny piece doing very well, accidently sucked it out during cleaning.. I'm an idiot..
i know.. Now have to start all over..
Not yet have seen any ugly moss.
I would say google image pick images of moss which strike you the most in simular setups as yours.. Still can come back and ask questions about the sp..
But the question moss and rocks doesn't tell much about what kind of rocks how are they shaped where are they placed and what would you like to see?