Re command, both pilots and WSOs can, depending on the MWS, of course, command if you get the opportunity and are good enough; it's not just a game for pilots.
However, this is one of those questions will you second guess yourself in five years?
In the interest of full disclosure, I'm neither pilot or WSO so you may opt to cease reading as of now, but given a choice, I'd recommend pilot - both in and out of the USAF, it gives you, generally, more options.
Finally, if you go pilot and, God forbid, don't make it, would you have the option to reattack as a WSO considering the age?
Good luck.