>>120153957a Hama Yumi/Magicslayer Arrow starts at 5 mt and like all weapons goes up by 11 mt at +7
so it's at 16 mt times 3 for 48 due to effective damage.
relatively, berserkers have a 9 str lead, and their belka axes will therefore sit at 24 mt+9=33. we can add the 9 str difference on to weapon mt since the later multiplication is distributive anyway
the 48 would be added to your "relative maximum str" and Thargarbage's def would be subtracted from that sum, and the new sum would be multiplied by 3 for the slayer bow.
for the axes, it would be 33 added to the relative maximum str and subtract the def and multiply by 4
it seems likely that you could marry dicken to someone who would make sure shara's defense remains at its base, 5, upon fighting her. so we have (43+str)3 compared to (28+str)4
for all str greater than 17, belka's axe will win.
both have weapon disadvantage and both have the same S-rank bonus added on at the end.
also, a male unit would be better for a WORLD OF STR since they can get strength drain, giving them 10 points that velour and velour!kanna can't get. some other things to consider are, of course, having hinoka, camilla, and elise adjacent and battle command and charm and whatever else