People like to use the hot side on these cars because either it's easy to recirculate or it's easy to add there with a prefabbed hotpipe. I had a very long technical explanation about the differences in location, then I gave up. The idea is that if you have the bov by the throttle plate, when the bov opens, the air will keep flowing in it's normal direction to escape through the bov. If you have it by the turbo, when the throttle plate closes, the air backs up and has to head backwards down the pipes to escape through the bov. There's a bunch of physics involving air mass and restrictions and such, but that's the jist. Take a look at the Greddy cold pipe for S14. The bov pipe faces such that any air that hits the throttle plate has a convenient place to escape.

Also, just a note. Recirculating can also help keep the turbo spooled (ignoring any rich condition because of mafs based systems) because it effectively takes the boost pressure from the pipes and uses it to blow into the turbo inlet. This blowing works just like blowing on a pinwheel, helping keep the compressor spinning.