I want to measure distances using the distance matrix tool on QGIS between the yellow dots and their closest blue dot. I want my output to be in KM and to be as accurate as possible. I don't want to use multiple different zones like WGS84 /UTM zone 9N etc. Rather just a single system which will give accurate / relativly accurate results.
This page has helped me to some degree (https://support.esri.com/en/technical-article/000006113) but I cant find the PDF to help decide which system to use.
I have tried using the distance matrix tool using WGS84 Psuedo Mercator but get my distances in Decimal Degrees which I've been told is nonsensical.