I've personally not heard many good things on the Artic Butterfly. The action over time tends to mess up the bristles. This is just what I've heard, not from personal experience.
I brush and wet clean.
Brushing is easier and quicker. Think of it as vacuuming your carpet.
Swabbing is more like deep carpet cleaning with an extractor. It is much better, yet more time-consuming.
I take a brush with me and do my swabbing at home.
I use the products at
Copper Hill Images. The wet method was pretty much invented and perfected by this guy.
Also, the site may answer a lot of your questions.
You can use the same brush/ swab on all your cameras if you like, the difference in them relates to the size of the sensor. Full frame vs. smaller size. Hence, a larger/ wider brush for full frame sensor.
Sensor cleaning is fun and addictive.