My opinion would be that the TRI qualification would be the best to go for, and for all the reasons given so far. It is an opportunity that will be harder to repeat as well. Jet jobs are relatively 10 a penny, but if you go right seat on a an Airbus it will be at least 3-5 years before you get the opportunity to become a TRI again. Whereas if you get laid off as an FO you are stuffed. I speak as a 737 FO with 5.500 total time, and 2.000 on jets (5.000 civil air transport on turbo-props and jets) and no job for 13 months now.