I've tried both, I found the Virtua Stick's stick to feel a bit crunchy and unresponsive.. the throw felt like an LS-32 but without the nice feeling mechanical smooth operation, didn't like it but it could have been worn out, however the hori SS just felt like a usual hori stick I thought, wobbly and loose. The Hori SS has a slimmer profile, not sure if an arcade stick can fit.
*edit*
Virtua Stick is easy to mod if desired, you just need to add 4 new holes to the metal plate either punched with a nail and hammer or drilled, no plastic to remove inside. Also roomy to fit LS-32 and Sanwas, I added stacked washers to sit the stick away from the metal plate so the shaft isn't as tall.