Personally i would say go for the command. However, with the prospects only being rumors i would be cautious. The rumor mill is always extremely unreliable and therefore not a good career advisor.
The second question is of course if you want do stay on a NB type or try the WB/longhaul lifestyle with all the associated insecurities that entails.
As
jadrolinija suggested, it might not be a bad idea to get a command ASAP, get the first 1000/1500 hours under your belt ans then check for other options.