
I've used AutoRealm (easy to use) and CC3 (a grind, but better control and appearance) for decades. I'm sold on OWM after only a day of fiddling with it. It's as easy to grasp as AutoRealm while being nearly as powerful as CC.
Once I get some experience and maps under my belt, I will be sharing this as my go-to mapper for anyone who asks at the Fantasy Flight Games forum (primary gaming forum for me).
EDIT: Oh sorry, I'm from Kansas in the US. Old time RPGer with a mountain of old and new games in my basement from Traveller to Genesys. Started playing D&D using the old pamphlets (now called the White Box edition I believe).