Re: [ANN][DOGE] Dogecoin - very currency many coin - v1.7 Available
PoW is considered safer than PoS - if you google for it you will find out why.
You can google a lot of nonsense, that doesn't prove anything
There is a lot of sensible analysis too, for example, google brings this http://hackingdistributed.com/2014/06/16/how-a-mining-monopoly-can-attack-bitcoin/