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That's a pretty open question - depends on the type of gravel and how fast you want it to be.
I've run most options from WTB (Horizon slicks, Venture semislick, Sendero knobby), Cinturato M that's been going forever and a Hutchison Touraeg 47mm and they all do what they're supposed to do.
I've got some heavier duty options for rougher stuff but haven't run most of them yet. 27.5 x 2.1 XC tyres for example
What’s the 650b tyre of choice for gravel?