Morta is weird. Beyond it physically retaining a little more heat (my thoughts on its density), feeling (and often smoking) closer to a meerschaum than briar, it differs far from meerschaum in the area of adding flavor to the tobacco.
I have two mortas, one I reserved for Latakia and one I had for Virginia. I recently switched over the VA-only to Latakia, because on subtle stuff, like Union Square (a great test, if you ask me) you can detect an interesting...well...swampy taste to the tobacco. It isn't sweet like briar, and doesn't have the very faint fresh "saltiness" of a (newer) meerschaum. "Swampy" would imply a bad notion, but it isn't, it's just different, and kind of hard to explain. It lends all tobaccos a very peaty, earthy tone, tasting similar to how a lake shoreline would smell. It's fresh, but very organic. Compost-like, but in a nice way.
Certain Virginias suddenly go from "clean" to "muddy." Since I like my Virginias on the light side, I probably would enjoy very heavy, pressed and aged McClellands in a morta, but complex Orientals, Red VAs, light, bright VAs and anything that likes a clean pipe skews off in a different direction. Again, not bad, but different.
And of course, YMMV. Morta is likely highly variable in this regard, as it comes from different locations and conditions as it turns into the product fit for pipes. Overall, Yak, I don't think Morta would be for you. 8)