My own opinion is that camping is probably the best way of meeting other travellers, especially other touring cyclists. I sometimes lock myself away in a motel room when I'm touring, when I would be better off in a campsite, mingling with other people. Admittedly, the sanctuary and comforts of a motel, are often too inviting too resist.
I have cycled the NT (admittedly 18 years ago now), and mixed up camping and motelling. I found that a number of the campsites did not have showers, so after two or three nights of that, I needed to stay in a motel. But carrying a tent and sleeping bag, gives you additional options, should things go wrong with either the bike or your own body during the day on the road. The distances between towns along the western section of the NT are vast. Small towns indicated on your maps, might just happen to be closed on the day you pass through. Be prepared, but most importantly, enjoy the ride.