The primary difference is the cost of the coax. There might be a redundancy issue to consider if you really need to care about that (and you probably don't), and there might be a concern about protecting the switch.
From a signal strength point of view, it is a non-issue. Distance is distance, it doesn't matter which path the signal takes if the cable length is the same.
I usually protect the switch from weather, since even the "high end" switches are of terrible quality, and add a little effort to minimize cable length. This means mount the switch near as possible to the dish without getting rained on. It seems to be the best balance between cable cost and switch replacement cost. Or possibly physical effort. I enjoy life more when there are fewer things that demand attention.