1) Are you used Bitcoin to buy illegal staff 
2) which better to buy legal things Bitcoin or Normal Bank system (PP,payeer,cash ,.............)
2) which better to buy legal things Bitcoin or Normal Bank system (PP,payeer,cash ,.............)
1/ Define "illegal". What is legal in one country may be illegal in another. And some of the items which are not de jure legal may be de facto legal.
2/ It is up to you. If you get good deals with Bitcoin payments, then go with it.