I agree with rainee here... B might be boring because he doesnt
have as much experience as A, and probably spends much of his time
helping others.
A might be a more exciting choice but a more dangerous at
that
It takes two to clap, while B might be boring, you could help him
to open up by finding what his interests are, you might be able to
find the part of him that is passionate, interesting and
spontaneous.
Sounds as though B is a very considerate and caring person, so he
might restrain the way he talks in order not to offend or upset
others(not joke, make fun of others). While this is an admirable
trait, most people will think of B as quiet, boring, not funny,
boring
So the choice is yours...
-a risky, exciting guy that probably moves on after conquering
you
-or a boring but considerate, kind, attentive guy who will always
stand by your side no matter what
