Aurora, Bux, CashCrusader or other?

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It seems that not many PTC sites nowadays use their original script but rather use certain retail scripts instead - either Aurora, Bux, or CashCrusader. What you think are the cons & pros about each type of script? Is there PTC sites that use their original script that are better than the three retail scripts mentioned in some ways? And, which one do you like the best - Aurora, Bux, CashCrusader, or some other script? Let me hear your opinions :)