My best token so far is PROB! With PROB, I can pay my trading fees which can be as low as 0.03% in ProBit Exchange. This what makes me hold onto PROB 
In terms of trading costs, the Probit token is indeed superior if we compare it to others, but we can only get that on the exchange itself, while there are no other exchanges, so I am a little less agreeable that Probit is said to be the best token so far, because in my opinion there are many other tokens that are much better than the probit token at this time.