I concur with Team A: "lean in". Every job can be hard. An easy job can be hard because it is unfulfilling. If you have the intellect to have the offer A, the appeal of "a life" (i.e., ample down time) may start to become tedious. It can be very hard getting back "inside". Ask anyone that has taken mat leave. Even male classmates of mine told me they'd been put on the mommy track even without taking leave, just by not seeming ambitious.
(My own experience is of making ambitious leaps for less and less pay and more and more hours several times through my life, so perhaps I'm doing it wrong! )
If the small company turns out to go out of business or be an uncoordinated startup that doesn't take your advice, you've had X months or years of higher level experience on your resume when you look at your options at that time. This isn't a life sentence. It's just what you do next.