At this point BTC has such a large lead in the network effect that the only reason to buy any alt coin is if you think it will outperform Bitcoin. So will PPC outperform BTC? As the main difference is PoS v PoW the question becomes "will Bitcoin's PoW model ever cause risk to its overall adoption?"
Why the answer might be yes: organized 51% attack from a large pool, NSA or other body corrupting ASIC hardware, or a technological advance that obsoletes ASICs but is held by a small party.
The third can be written off at this point as it isn't a risk in any reasonable time frame. The second isn't much risk as most ASIC manufacturing happens outside the US, and is distributed between multiple continents. Could a coordinated group of miners pull off a 51% attack? I suppose they could but I don't think they would due to the fact that they would be killing the goose that lays the golden egg. Even if those miners invested heavily in another coin, destroying BTC at this point would endanger the whole cryptocoin ecosystem. To me PPC isn't a hedge against BTC