I just dropped stalkers for axis-- they are not the same disc at all but work in the same ways. Stalkers are much faster, more like a volt in the speed but the flight is more similar to an axis (specially domey ones) Vector has a bit more low speed fade but similar HSS where the axis has good HSS but less low speed fade than a stalker and slightly less distance potential. If you are looking for a SLOWER stalker, then the axis/tangents will work.. if you are looking for a more driver-like stalker then a volt would be a good choice.
Stalkers are a odd tweener disc IMO where they are on their own level compared to other molds-- its like a buzz on steroids where the MVP discs are true to their designs. No MVP putter/mid will go as far as the stalker.