All cell and internet all the time, for at least 7-8 years now. My cell is used much more for email than for talking but works well for both. Internet is microwave with static IP. We have Dish for TV and I can use our broadband for Netflix, etc. I don't pay per view anyway, since I am already paying a considerable sum for the Dish service, but I could do it via the broadband if I wanted.
I like communicating in little 1's and zeroes over radio waves. I don't know if cell tower generators will run out of diesel before mine runs out of propane, but an outage lasting that long would portend a pretty serious Emergency after which phone service might be the least of problems.
On the security front, it is much easier to disable a landline than wireless, although both can be managed, I'm sure. I just didn't find the 911 argument compelling at the cost. If you are using cable or VoIP for your "land line" you are already internet-dependent, and not on a true land line in the traditional sense.
Of all the arrogant, unresponsive vendors in my life, ATT was the worst, in all their forms.