I think both are potential risks. Both have pros and cons. Going to Holland - do you know anyone there outside of the Business sector? You say you usually prefer to work from home - so it's possible you could drink during the day as well if you wanted/needed to. But managing a team of five? That sounds quite stressful if you've not been used to it.
Staying in southern Spain could be stressful if you have to compromise financially. If you do find yourself relapsing, what structure and support have you got?
Whatever you decide, and only you can, if you really want to stop drinking, that has to be the number one priority. Have you considered rehab?
When I was drinking alcoholically, I'd drink cos it was sunny or raining, any excuse. But also with life changes and stress. And these are big changes here. Do you have a sponsor you could discuss this with?
Good Luck .