Millions of people in the UK either have a Cash ISA or Stock and Shares ISA. However, out of these two, I have a clear favourite: the Stocks and Shares ISA. Over the past decade, money held in a typical Cash ISA has lost purchasing power in real (inflation-adjusted) terms. But I'd be very surprised if stocks don't continue outperforming cash returns. Don't be a forced sellerStill, I do have a Cash ISA to keep some savings for emergencies.