I like P411 myself but I use both. I don't think one is safer than the other, however a lot of providers use P411 over DC.

I am on both but find I like P411 better.  Easy to use and it seems a lot of the touring ladies use it

Can't compare the two but have never had an issue with 411. Customer service is top notch, screening was painless and discreet, and there is a steady stream of local and traveling ladies.

On where you are.  Dc is not as widely used in the Midwest as it is on the east coast.