Keep in mind that A rating is describes as excelent ,B rating is described as good and C is described as fair.
The list of B rated coins is :
a)Etherium
b)NEO
c)Cardano
d)EOS
e)steem
All other cryptos are C's and D's and yes even BTC is a C rated coin.
Weiss rates investments. BTC is indeed the value exchange currency but at the moment its slow and expensive to trade. This is going to be fixed soon with the bitcoin updates coming during 2018 and then i am pretty sure there will be an upgrade on the rating as well, so BTC is going to remain the king.
The B rated coins are all coins that are not just value exchange coins. The are the internet of money. A way you can use money as platform. What the raters see is that a platform coin can be used for much more than just transfering value and this makes the investment less risky as well as leaving more room for profit.
I think in 2018 we are going to see coins like BTC going from c to higher and maybe even etherium going higher on the other hand there will for sure be coins degraded as they will fail or get hacked or prove to be garbage. The more the internet of money becomes a reality and platforms for using the internet of money are implemented prices will increase and upscale crossing the 1 trillion market cap.
Prices of all B rated coins have gone up in the last 24 hours ranging from 5 to 12 % increase.
Make your own research on where to invest and be responsible.