I mostly use a computer because you can get a better idea what is a good deal, and fits in my budget. If I had stacks of cash, I could easily see myself booking everything via my phone.

But I'm too much of a penny pincher..

But I do often only pre-book the first night/s accom, then book the rest as I travel and know where I will be when. But I do travel with my laptop, and often will park up somewhere and hotspot it, to find that days accom. (+ I get cash back deals on computer)