It all depends on your team in my opinion. How familiar and comfortable they are using any of these. The estimation based on Story point or T shirt size is relative so any method will work fine. In Jira Software you already have Story Point field so you start using it immediately. There are reports like burn down chart that are based on Story points and a number field will help in building some other reports as well.
I hope it helps.
Ravi
Does JIRA have some kind of a component that factors in doubt, effort and complexity all together somehow using story points?
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