interested. i have also recently pondered the cacti.
one general note, i have NEVER Met a truly irredeemable spiny plant. all the spiky plants that i know of, save for those somewhat unpleasant... (looks them up) "siberian pea shrub", but they're not absolutely horrid, i just kinda don't like them.
but raspberry, blackberry, roses, cacti - they bear nice fruit and are good other than it being unpleasant to touch them.
cacti are kind of jerks though, hard to say what kind of energy they emit.

but a few times recently i've gotten to know the hidden inner personhood of certain plants. diamond willows can be a little pranky sometimes. lilacs can be real generous.