Any of the previous answers could be correct.
A consideration I would have is, which is the better airline?
The airline with 747-400s must be a fairly large established company and will most probably be around in years to come. (and hopefully promotions).
The other airline runs 737-200s which are just about ready for the junk yard, so what is this airline's future? Are they running on a shoe string, do they have plans to buy more modern aircraft? (no offence meant to 737-200 pilots).
I would factor those points into any decision making along with money making and the cudos (spelling?) of a fourth stripe.
Good luck.
