I would keep my job in VD with 3 days remote possibly.
… where would you move in that scenario?
You need to take your income into consideration. The higher your income, the more advantages you will have with low taxes. If your income is low, low housing prices and low cost of living are more interesting for you.
If I understand right the map, it means that if you want to live in Suisse Romande, the more desirable places are Ajoie or Alpine valley in Valais ??