Alexo,
What you should use is what you are comfortable with. Try several different brands of paint and see which one works best for you. Use several different brands on a scrap pieces of bodytube and get the feel for how it performs.
You are going to find you will get a lot of different answers to this question. What people will suggest is what they have become comfortable with. You will see many very good paint jobs from different rocketeers here on TRF using all brands of paint.
Krylon is great and I have used it on several projects but I absolutely cannot get the gloss I like so I use ACE Hardware rattle can paint exclusively. Used to be it took a while to dry, upwards of a week, but the last few cans I have used have dried much faster. Maybe they have changed their paint formula to a quicker drying recipe. Regardless, the paint is very glossy and I am able to get the performance that I like from this paint. The only problem is they have a limited choice of colors.
I have used Duplicolor color changing paint. It is unique and the results are very nice. The problem is it is pricey. I do, however, like the Duplicolor gloss paints, but again, they are somewhat pricey also and I think cheaper brands do just as good a job.(my opinion only) I've never tried Wal-Mart's brand but plan to as they have a myraid of colors and sereral TRF'ers use them with great results.
Be sure to use a compatable primer. Remember, the finished paint will be no better than the base you applied it over.
Paint is like ice cream, there a zillion different kinds. You just have to find the ones you like.