Sony a6700 : Lens Advise

Hi All, I recently purchased a Sony a6700 and am considering which lens to get first. With an upcoming Eurotrip, I’d really appreciate suggestions from this sub.

I’m leaning toward the Sigma 17–40 f/1.8, though I’m concerned about its weight and size as a travel lens. The Sigma 18–50 f/2.8 is my alternate option.

Would appreciate inputs from the community, especially from Sigma 17–40 users who’ve used it for travel.