Check their opinion of you, and whether you'll be able to achieve +190 opinion overall by the time you want to annex them. Don't forget to include the -100 forced vassalisation modifier, decaying at 2 per year. Eg: If you've accumulated 400AE with them, annex/release is probably the best choice.On a related question, i should probably full annex and release nations rather than force vassalize them? So i can avoid the "force vassalize" penalty?
(You can get at most approx +290 after vassalising them. (200 improve relations + 25 royal marriage + 25 gifts + 15 subsidies + 25 influence nation = +290) You need +190 to annex, which implies -100 before vassalisation is ok, but you might not be able to do some of those diplo actions, or you might already have some positive modifiers which will decay, so it's probably best to do the full calculation instead of saying "anything more than -100 is ok".)
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