The only company to make V-Brakes would be Shimano and I think right now the top level of their V-Brakes would be Deore or possibly they still make the XTs for trekking or if lucky you might find an old XTR set for a lot of money. In terms of just linear pull brakes of which V-Brakes are a brand, I would go Paul if you are really looking to upgrade the brake arms themselves. However in the end probably what you need is better pads and shoes and cables and housing. For pads you want something replaceable from either one of the Stops: Kool or Swiss and you want good stiff shoes that take replaceable pads (and you can get those as a packaged from either one) then for cables you want something stainless steel and polished with no coatings ideally a Jagwire Pro or Elite and then for housing something nice and stiff and compressionless and you can get all of that with everything you need from Jagwire in their kits which they have in the Pro or Elite versions.

There are very few linear pull brakes I would replace and generally if the bike comes with ones I would replace I would just get a different bike as they aren't worth it. The arms make a small difference and certainly better ones will have an effect but truthfully the pads, shoes, cables and housing will make the biggest difference for the money.