This is exactly what am I thinking when I read this, you cant gain from holding a stablecoin since the price is stable and doesnt have volatility.. Obviously the best Stablecoin too would be USDT and TrueUSD
Basically all stablecoin tokens are good and have no volatility because their value is always stable and refers to the value of the USD currency in general, this is something that many people have known in the past.