I would not move from a permanent contract B737 FO in Europe to an FO contract position in Taiwan.
You have the four stripes much closer where you are now than in any of these two companies in TWN.
At the moment I came to CAL I had the chance to go for a permanent A320 FO position in my country and I was blinded by the Mighty B747-400ERF in CAL.
All my fellows who had accepted the A320 FO position have been upgraded to Captain at the end of last year...and I am still an FO
Anyway, you can apply and see with your own eyes.