dealership maintainence is pretty standard and cost same as any other car like corolla, elantra etc. So for keeping the warranty, its better to stick with dealership. car is loaded with features so its better to keep warranty in tact.
Also switching to Yokohama tyres will surely serve better in future since new BG tyres will be traded in well at a good value on day one and yokohama will serve more consistently over coming 4-5 years IN SHA ALLAH