I use a Dean Rhapsody 8-string. Also my two Hamer 12's as below.
I find they work best with a pick and also with some 10" speakers in the rig to get that brightness out.
You CAN play them with fingers, but to really accentuate the brightness of the drone strings and to get that clang, I use a pick.
The 8 is a lot clearer than the 12, but not as big as sound, obviously.