I think it is safer to trade DIA at big exchange because if you feel the potential project you can choose to invest. Certainly, DIA price will be very high at the beginning because the project is being interested by some big investors and will not be easily purchased.
How do you know the price will be high, even though sales have not yet begun and has DIA announced the exchange where DIA will trade?
A safe option is to buy at the exchange, which can be a wise way to ensure profit and avoid investment losses.
There is no safe word to invest because everything has risks