I'd look for surgical stainless its more resistant to tarnish and oxidation as well as keeping a Sharpe edge and not chipping the blade due to being higher carbon steel .
I think bone cutters are one of the better investments I made due to the coral I'm occasionally fraging.
I have a dremel tool but because I don't cut many hard corals I've only tinkered with it.
The bone cutters make really quick work of trimming base rocks splitting up frag plugs and cutting soft coral off the rock without damage to the soft tissue.
All of which can be doen with a rotary tool as well so it would all boil down to preference.
Anything to big to cut by hand say like splitting a big zoa rock can be chiseled I personally use a large 14" snap-on
slot screwdriver the tip is 7/16" wide and it has served me well I can imagine a sharp chisel would only be that much better.
Also I don't use a scalpel or exacto , I use regular steel razor blades for cutting soft tissue , there great for filleting zoas off disc and plugs for re propagation on another surface.
The other tools work great , I just use these cause I throw them away after each use and I can buy a sleeve of 100 of them for 7$
IIt all comes down to what you like and what your doing with it IMO.