Which ones better (1) ask to hang out over messenger or (2) over the dating app ?

I added this girl I work with that I’d like to get to know better because she’s really nice and I think she’s cute but I don't know which approach is better messenger or dating app so she knows I’m interested. P. s I don’t wanna hear don’t date co workers
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I usually go out once a week for drinks with a bunch of work people is that a good way to just get her out to get to know her outdo work
Which ones better (1) ask to hang out over messenger or (2) over the dating app ?
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