PPC or PTC which one do you prefer?

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Paid Per Click (Adsense) or Paid To Click (Bux site), which one do you prefer? Can you tell me why you prefer one of that? And tell me what site you use to PPC or PTC! I prefer to PTC because it's easy. PPC is good too if you have high traffic and it can be better than PTC! I use NeoBux, PalmBux, and other Bux site for PTC. Then, I use LiJit for PPC. So, how about you? What do you say?