IMHO it's hard to choose, and really is up to personal taste.
For my own gaming I am using the original mimeograph map. It comprises most of the areas of interest and matches up fairly well with about 1/3rd of the Judges Guild map.
I am also tempted to use the JG map, yet because of copyright issues I tend to avoid it as most gamers cannot get one for themselves.
I was speaking with Aldarron/Dan on the phone the other day about this very same issue. The core idea to understand is that Blackmoor is truly a living world and is constantly changing in the early years. Up until 1977, the setting isn't being viewed by Arneson as a product. As a Blackmoor Ref, you need to decide where you want to place your game both within the game lore and within the real history.
My advice is to go to the beginning and use the original map.
You can find the original map here:
https://scontent-den4-1.xx.fbcdn.net/v/ ... e=60064356We are also selling printed maps of the Town and World setting here:
https://store.secretsofblackmoor.com/co ... oor-poster