I have the WIFI 3G model simply because I travel for a living. It means I have 100% connectivity wherever I go.
I chose a 3G carrier different to my iPhone carrier so that should I be in a weak signal area for my iPad, I can use the WIFI hotspot function on my iPhone as a workaround.
However, if I was only using my iPad at home, and at the odd place where I knew there was a WIFI hotspot, maybe just a WIFi version would be adequate.
I'm based in Spain and when I travel to the UK I just change over my SIM to a UK carrier.
I would just advise anyone considering buying one to think about how and where they will use it.
Sent from my iPad using iPF