I have been doing this for a while now, and I use both. I like a wax brush for really detailed pieces and chairs, but I like to use a rag for large flat surfaces like on a dresser. So if you are thinking about tackling your first piece, try the cloth application and save your money for a wax brush if you really get into painting furniture like me.
If you need more tips on painting furniture, you can check out my Video Tutorial tab to see my library of videos.
I hope you are enjoying my tutorials. Have a question? Make sure to shoot me a line if there is anything you want to see that I haven't covered yet. Check back for some fun reveals coming soon.