What Best Function to use for using BB to connect another phone

I have BB Passport, I see Mobile Hotspot and Internet Tethering.

My BBPP is my primary phone, I have an App on an Android NP that I wish to use occasionally using my BB internet.

I want the Android to access the app quickly at the time in a store.

Which function would be best/fastest to use; the Mobile Hotspot or the Internet Tethering?

Mobile Hotspot warns it is a power hog and recommends that phone is plugged into USB. So, is Inter. Tethering not a power hog?

I've tested both and both work, as in, I can access the Internet via the BBPP, with no sim card and no wifi on the Android.