Best way to connect laptop to ultrawide monitor

Sep 10, 2018
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I have thinkpad X1 Carbon 6 (2560 x 1440) with the following ports:
2 x Intel Thunderbolt 3
2 x USB 3.0
1 x HDMI 1.4

and I'm buying an ultrawide monitor U3818DW (3840 x 1600) with the following:
1 x DisplayPort
2 x HDMI 2.0
2 x USB
1 x USB type C
4 x USB 3.0

What would be the best way to connect the two for best performence (refresh rate and such)?
What cable/adapter should I use?