Thanks to all of you for your opinion!
I realize that the choice should be simple, but given that the operators are very similar (I know them very well, having worked for both, and I can live with either), the main question is...
Is a better type giving better career opportunities in the long term? Or a command on a smaller type still the best option?
What I tend to notice is that the most difficult part for us bizjet drivers is to end up in that class of planes, Falcons, Challengers, etc.
I know many captains with many times my experience "stuck" on the light to midsize kind of planes for years, if not decades.
The type of operations on the bigger plane would be totally new to me, which is appealing, versus the usual routes I have been always flying.
On the flip side I keep hearing the same advice from many people I hugely respect: never turn down an upgrade offer.
Oh well, it is still right what you say, it is a win win situation, but still paradoxically sometimes you would like NOT to have the choice.