When I do mathhammer, I judge a unit on the basis of its average damage per point it costs output against a "basket" of likely targets (a bit like economists use a selected "basket" of certain goods to measure inflation).* I use GEQ, MEQ, GravEQ (gavis equivalent), TEQ< VEQ and KEQ. The 8th edition mathhammer wesbite and the app are just fine (app is better). I enter it into a spreadsheet and voila, you get your answer.
I'll see if I can dig it up, but I think I compared various load-outs of Deredeo against the contemptor dreadnought a while back, and I think it came out OK (despite not being core) on that comparison, on that basket of targets.
* Yes, target selection is a critical skill in 40k. You don't shoot pistols at knights. You don't send thunder hammers against guards etc.
That said, whilst it is unlikely that you would ever shoot a Arachnus heavy lascannon battery at a marine, or a las-cannon tactical marine at a lone genestealer, stranger things can happen. That marine or genestealer might be holding an objective, nothing else is in range and if it dies you deny your opponent VP etc.
This is why I do mathhammer on a 'basket' basis. If you think you will never, ever shoot a Deredeo or Contempor at squishy targets, change the basket, or weight them less. Take out the GEQ and MEQ, maybe even the TEQ. Maybe throw in a dreadnought and dark raider equivalent stat-lines. Either way, in my experience the basket approach to mathhammer gives you a great feel for what the unit can do in a range of situations, rather than just against a handful of very specific profiles which you may or may not come up against regularly (or, even if you do, might not be targatble for a turn or two).
Edited by XeonDragon, 14 October 2021 - 01:38 AM.