bmw or mercedes, it comes down to personal preference, at the end of the day you want something that wont fog up, so youll want something with a thermal lens, apart from that its down to comfort etc, i4s are great but if you have a fuller face like me lol then they wont cover your full face and ears, so you can end up un protected in places. my current favs are v-force grills with thermal lens, no fogging etc,