Facebook Button - Questionable

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I can't decide which way I wanna go. If it's important to follow the guidelines (maybe even trend) or make a custom button. My only concern is that I'm afraid to click on blue buttons saying "Sign in with Facebook" already. But if I see regular button I'm more above-board to tap/click on it.

What do you guys think? "Regular" blue Facebook button or custom colour button with simple text saying "Sign in with Facebook". And it's onboarding process.

See the buttons next to each other on same screen for detailed comparison.

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