Pay for a TR without a proper job offer, you are wasting your money.
Unless you can enter training with a company straight after TR is completed, it is a very bad idea. Example, what do you think you can know about a B737, A320, Citation or Kingair, after few hours in the simulator, and huge FCOM's about them?
Close to nothing, it is a step to learn, however unless you have somewhere to allow you to learn about the AC, you are in a dead end, and loss of lots of money!
Having a TR will put you at disadvantage with some companies, as some have their own programs for this.
I seen many go this way, spending £15.000 - £30.000, on TR, and it was like throwing money out of the window!
Small aircraft like King Air, are not easier, as you need loads of hours PIC, to be able to fly the aircraft, and most of them are Single pilots ops, so very hard to get experience enough on it.