1% interest has no real effect for savers. It is just slow inflation on money supply. After one year you might have 1% more PPCoins but this doesn't let you buy more real goods just by itself. Only a rise in PPCoin value does. So there is no advantage over bitcoin at all due to such an interest rate.
The real advantage of PPC to me is an ecological one: All other major cryptos will soon waste an awful lot of energy. An ecological problem of that scale would most probably contribute to an economical one (externalized cost a.s.o.)
So PPCoin advertisement to me should focus on:
- explain people the wastefulness of BTC and LTC (this is not well done today. The PPC Paper just states the wastefulness of PoW but doesn't explain it in detail)
- show them why PPCoin is better in this regard
- And, by the way: Show people that PPCoin is backed and developed by more people than just Sunny King. This needs to become a community project (in reality and perception) instead of a one man show to build trust.
Please check my thread on PPC money supply over at ppcointalk.org. My concern is that PPCoin could be even slightly more volatile than BTC by design.