A lot of dealerships tend to use water-based tyre shine, but you won't get a high-quality finish unless you use a gel tyre dressing. Water-based tyre dressings will wash off after the slightest bit of rain, and provide no protection against UV rays - making the tyres go brown.
If you want to have glossy, black, factory finish tyres then a tyre gel is the best way forward - see this best tyre dressing article for the best, most cost-effective products on the market.
Hope this helps!