Is a USB-C to HDMI adapter or cable better for 4K@60hz output. Using a MacBook Pro connected to LG 27UL850 4K monitor. What brands are recommended? TIA
The monitor supports USB-C input and 60W laptop charging. I'd use a USB-C connection for all. This way you can use the monitor as a charging dock. As it will do charging, video, USB 3.0 output and speaker/headphone jack. Make sure to use a 60w or greater rated USB-C cable.
This is assuming your Macbook is recent enough for Thunderbolt 3 and only needs a 60w charger. Which I don't think will work for the 15/16 inch models and need separate power.
If it is an older Macbook. You should connect the Thunderbolt 1/2 port to the Displayport via a Mini Displayport to Displayport cable.