Sia for me here, personally Sia seems to be easy to use and i think the UI suits for non-technical person, and because of the huge supply of coins they have, the service they offer could be real cheap as the DEV stated that he doesn't wanted the coin to be too expensive because that coin is uses as a payment function
The devs specifically said that their focus is more on their product not so much on the actual price on each coin...( That's the focus i want to see )
The payment function is yes, Siacoins. But overall the storage is cheap while a siacoin can be what ever price and the storage will still be cheap.. The host will just adjust the price. That's all.
All these coins have their white paper but they don't even compare to Siatech with their working product .
I'm heavily invest. & this will be nice Long-term HODL becuase the cloud storage is rapidly growing each year.