Do I go for JTR or do I round out other squads first?

Didn't think I would have to spell this out since it should be common sense...but the requirements for JTR is BB8...which is FO, so the question again would be, would going for FO>BB8>JTR right away be more beneficial than farming out some pretty decent toons such as shoretrooper, deathtrooper, sith trooper, Wedge, Baze, Chirrut etc etc..