My new Samsung Omnia W has Internet sharing and the reviews say it also allow you to set up Wi-fi hotspots. I read somewhere  you can also set Windows phone up as a tethering phone - though I have not figured out how. 

If I want to use the phone's mobile data connection from my iPad, which is a preferred way to go and why?

(a) Windows phone set as a tether phone
(b) Set up a Wi-Fi hotspot using the Windows phone
(c) Turn on Internet sharing on Windows phone