First I've heard of Mysterium, sounds mysterious. As for not being in bitcoin, I'm not sure I understand the logic there.
No other crypto has the liquidity of bitcoin. The alts may be faster and cheaper, but that doesn't mean squat when you can't get in and out of the market with decent size.
Btw, have you heard of GRID+? Their ICO is still ongoing, but prices on EtherDelta are already bellow the ICO price, LOL: https://etherdelta.com/#GRID-ETH
Thank you for your comment.
You mean Trading liquidity of Bitcoin. Because from a use perspective it is less liquid as it has higher fees and higher confirmation time.
I have to check it out indeed.