I used to bring OpenWRT routers everywhere I go. But if you worry about performance I'd actually recommend you get a router that's supported by AsusWRT Merlin. I've had a lot of WIFI performance and range issues with cheaper routers on OpenWRT.

I recommend looking at the supported devices list, since some models have Chinese v2 models that are indistinguishable, but unsupported.

https://www.asuswrt-merlin.net/

https://github.com/RMerl/asuswrt-merlin.ng/wiki/Supported-De...