Grin will be outdated once LTC implements mimblewimble.
Beam will be outdated once LTC implements mimblewimble.
ADA is being developed by academics with not a lot of real world success and they're behind on any possible schedule, their business plan also has little value for real world businesses.
I'd invest in none of them.
This is a nice analysis. Maybe it is true, maybe it is not, but it is very acid!