There are some excellent gunsmiths in the prairies. Prairie Gunworks is one of them. They can easily make you what you want. Another is Dlask in Vanc. Nice stuff, bring money. I have used Dennis Sorrenson (250) 652-5610 in Victoria and Tom Norman (604) 854-8079 in Abbotsford. Both good guys to deal with and reasonably priced. Tom built my Wby and put an in barrel brake that is only on the top half - nice work.
Brownells has lots of different designs too but export is a pain.
Yes, the Vais, with the front ports, will reduce recoil less but it is quieter. The better a brake works, the noisier it will be perceived by the shooter and bystanders.
Baffle brakes (JP, OPS, "fish gill") will be more effective then a single expansion chamber brake (KDF, WBY, Vais). Larger diameter brakes are more effective then small diameter. Angling the baffles "back" is much better then "forward". No free lunch.
Now if they would just let us use silencers. We and the neighbours would be happier.
Jerry