Charging specs are fairly complicated so it is hard to say. Even if your Android phone for example supports faster charging than the iPhone (not hard, the iPhone is one of the slowest charging flagship devices around), it may not support that specific Power Delivery standard. My iPhone for example supports 15W wireless charging. Even though I had a few chargers that supported 15W charging, the iPhone uses a specific PD profile for that and I needed to buy a new charger that supported it to make sure I got the full speed.
So basically without knowing what charger, what specific Android and what specific iPhone you’re using, it is impossible to say. I find it unlikely that the charger itself knows it is connected to an iPhone, let alone would it prioritize it.