Wifi only means you can only get on the internet when there's wifi available. Wifi plus cellualar digital means wifi and anywhere there's cellular reception. So you are limited if you just buy the wifi. When you sell it, you will get more money and have more 'takers' with both. We use ours when traveling and use it for maps, email, anything we need. Good luck with your decision. I, personally, would not want to be limited in its use.