I think we have a third player for this start of the mimblewimble adoption; its WINK another altcoin with 42 coin is the max supply, no ICO, no premine, no mandatory developer tax. More assets will be forked as i understood, check this link.

How much will WINK be worth?
This is a very simple calculation, because WINK is the simplest asset on the WOKE chain. Because WINK is a superior implementation of technology, governance, game theory, and cryptoeconomics, we can assume no rational actor will use any other cryptocurrency. Then all we have to do is add up the current marketcap of all currency-centered cryptocurrencies (which we will limit to the top 10 for obvious reasons), which as of October 2018 is ~$151,660,568,655USD, and divide that number by the total number of WINK, which is 42. This gives us a nice round number of $3,610,965,920/WINK. That 3.6 billion US dollars per WINK. That is obviously an extremely conservative answer, as it is the current, underutilized value of the top cryptocurrencies, and WINK is aiming to absorb all global financial markets. The global GDP estimate for 2014 was 78 trillion dollars. Sevently-eight trillion divided by 42 WINK is ~1.9 trillion dollars per WINK. Even that is conservative because economies must grow to prosper and so in 42 years, when the last Wink is mined, we can assume the value of just one of these puppies is going to be much higher than that.