Nice to have options!

I would go with a gig in Hawaii flying the Caravan or with the gig in China for the following reasons:

- Hawaii. Before comitting to this option, you need to find out the company envisions you to meet the 135 minimums. For example, how can you meet the 500 hrs PIC XC time flying as SIC??? If there is an opportunity to do so and the upgrade time is not longer than 18 months, I would go with the Hawaii gig.
Flying in a multi crew environment is valuable experience. So is the opportunity to learn about advanced systems.
Once you upgrade, you will be able to log PIC turbine time. Granted, it is SE turbine time, but the airlines really don't care. Point in case are F16 military pilots...

- China. This is not a bad gig at all. It's a FAR 141 environment. It is owned/operated by PAIFA (Pan Am International Flyight Academy) which also operates here in the US and has an extremely good reputation. They're training Ab Initio students that will be flying for a mojor Chinese carrier. It's a very professional operation from what I understand. They're opening up more satelite schools in China as well.
In addition, since the recuirement is that you need to build a little bit more time before you can take the China gig, you have the opportunity to ly for the school in Texas.