Weissratings issued the following ratings for graphene based coins (for whatever it's worth)
(A = excellent, B = good, C = fair, D = weak, E = very weak)
BitShares: C+
EOS: B
Steem: B-
B is the best given rating, so graphene based coins are among the best rated cryptocurrencies, according to Weiss.
How-to buy BitShares for FIAT or BTC/ETH