Really depends on the task you are trying to accomplish. I repaired a key mark in my ex's Scion with the factory stuff in the "tube". DON'T use the supplied brush, its massive, and the results will look like crap.
I personally prefer a toothpick. (many light coats will yield better results than a few thick coats.)
I then went over it with a rubbing compound, and progressively went over it with lighter polishes and finally a wax. It took me 4-5 hrs. but the results were flawless.(I'm anal, it takes me 4-6hrs to wash and wax my lotus which is a very small car) the scratch completely disappeared to the naked eye.
My jeep has some "repaired" scratches. which means I will be repairing these halfassed repairs.
I can take pics so you can see what it looks like when you use the supplied brush. Just using the toothpick instead of the brush without any polishing afterwards gives so much better results, I'd suggest you do that even if you're not going to polish.