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cabbybaby192657dIf you love two people at the same time, choose the second one, because if you really loved the first one you wouldn't have fallen for the second. ~ Johnny Depp
In your case, Gson really isn't that big a topic - you can probably learn all about it in a week or less, so I'd stick with that then tick it off the list then move to something else. (Though it's not as used these days as something like Jackson, so check that out too.)
Generally, I'll pick one of:
- Whichever is more interesting
- Whichever is best for your career
- Whichever is "up and coming" as opposed to "old and dying"
- Whichever is fresh in my mind
There's no hard and fast rule over what you should prioritise of course, but generally I find one of my possible "things to learn" fits in a lot of those categories.