Types
A useful type rating is one that gets you the job. If you are guaranteed a position upon completing a type course and the promised job will cover for the investment, then I say , go for it.
Statistically a B737 type would be the best type to get as there are quite a bunch of B737īs flying around the world. But this depends what you want to do and where you are aiming at. If you want to fly a Caravan a B727 type will do you no good.
I would be very careful of investing a lot of money intio a rating that you might not able to use. This is especially true with lowtime pilots (Under 1000 hours). A 300 hour pilot with a B737 or B747 type with no experience in the aircraft , well,you only demonstrate that you can pass a training course and a checkride and will be in the bottom of the line when pilots are being selected with virtually everyone with time in type in front of you. Airlines still will train you to their standards and procedures regardless if you have a type or not.
Cheers