Mondial, but I have to qualify that answer.
I have only two Mondials.
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This Mondial is brand new. I've not used it or even wet it yet. It looks great, but how it performs is a guess. I'd guess great, but it's a guess.
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This Mondial is my favorite boar.
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This is I think my favorite Zenith boar (it's new in the photo, but I've used it a good bit now). I have a good many Zenith boars.
To answer your question I'd say if I had to keep just oneI'd shoot myselfI'd be hard pressed but it would probably be the Mondial.
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This Omega Jade (damp in photo) is also a contender. From Connaught only I think. Premium brush for sure.
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What a hard question.
Happy shaves,
Jim
Muahaha, buy them all! I do own a couple (a dozen) boar brushes but yes, I'll be hard pressed to decide which one to keep if I had to keep one. I guess i need one of the modials and zeniths. Untill then!