Log in to the hotspot and see if there is an option to turn off wifi. There certainly is on the TP Link adapters I am currently using. I can't remember if there was the option on the BT hotspot 500s I used previously or not.
If you intend using the white discs there is no advantage in the SH2. The only reason to ever change to an SH2 is to be able to use the black discs.
