No not all GB´s are worth the same, several are to be avoided, while others nearly are a must have.
Most GB´s take up considerable amount of space and the journey to level them is long
– so it is worth giving it an extra thought which GB´s to put in the mudd.
GB´s that has coins as output usually gets void when reaching a higher level – houses and other buildings will easily outperform them.
GB´s that includes giving FPs are usually a good choice.