Buy a car or lease another through a company?

I'm currently leasing a car through AG for 0.5% of the list price - all inclusive, just put the car back in the yard and get a new one. Refueling/charging costs a flat rate of €100 per month. All-in ~€500 from the net. Now I'm wondering whether buying would be cheaper. For example, there is a Caddy Maxi Style, 15k down, one year old, 41k. If I invest the money in the all world, the calculated return after taxes would be €200. Refueling would then be more like €100 more than the flat rate. Copilot says depreciation, insurance