Not sure I get this question but to chime in on spurrina vs nares just multiply your total pet mab (including 40 from base stats) and BP dmg with each set. Bam easy answer is easy.
There are only 4 sources of bp dmg that I know of and 2 are ra/ex from legion so assuming you only have af3+2 for bp dmg besides the gloves you'd need to have to have more than 76 pet mab before gloves for spurrina to win. So at least 37 from gear/atmas etc not including gloves. Max petmab from gear without gloves not including nirvana is 30 so yeah unless you in abyssea or have nirvana nares going to win.
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