Being realistic the 35 Whelen, 350 Rem Mag, and the .35/284 will all do the same thing. I doubt you could prove a meaningful accuracy or velocity difference in well chambered barrels. To me there are 2 reasons to use a wildcat 1) To get better performance than is factory available, 2) Just because you want a wildcat. Both reasons are good ones, but if you are not a very experienced reloader, and willing to fork over the extra $$$ for dies, then stick with one of the 2 factory offerings.
As always just my opinion and another way to look at what you want. Sean