It is too early for you to worry about making decisions.
Provided that you do get an offer that expects an answer before you have
other choices, and that you are not fully satisfied with the terms, I would
like to say that such kind of situations occurred to me before (in fact,
more than once). The closest instance was a faculty position not to the best
of my desire. My thesis advisor said that "If I were you, I would probably
take the offer." My postdoc supervisor, on the other hand, didn't give me an
explicit yes or no. Instead, he told me a few success stories of the big
shots who are renowned for their solid contributions to the field. They all
started from nowhere recognizable, "and besides," he added, "the school
offering you the position is far more distinguished than those places."
I agonized for quite a while and ended up listening to neither of them. I
passed this wonderful opportunity, because the resources I can possibly get
for conducting the research of my own standard do not meet my calculations.
Yes, a faculty position is a dreamed job for me, but I cannot take it only
for the sake of realizing a dream, by neglecting the future development. I
never regretted. In retrospect, thankful to those tough decisions I've made,
I am more clear about what I desire. I am very happy with my current
position.
I do not want you to follow my example, unless you are on exactly the same
shoes as was I. Everyone is unique. You may not be aspiring for the same
goal. The intent of my sharing the story, is only to tell that no one can
make a decision for you. You are gambling, and yes, whole of your life.
Whether you are willing to take risks and how much you can stand the
consequences of losing the bet shape your future. It is a golden opportunity
for you to reconcile what you truly want and where your potential stands.
My $0.02