1. Custard is good. Custar's screen resolution is high, Custar's resolution is 1280*720, Philips's is 1064*600. Custar supports 4G and can access the Internet through 4G, but Philips does not support it.

2. According to my personal understanding, Philips should be relatively the best here. If ranked by quality, it should be Philips Feige Custar. Custar has the best price/performance ratio. Unless you have special requirements, Custar can basically satisfy you. The main interface of Feige is more beautiful than Custar. The functions are roughly the same.

3. The navigation sound quality of the Custar brand is not very good in terms of clarity and stereo sound. It is boring and dry, and adjusting the high, medium and bass has no effect. The performance is relatively unsatisfactory.

4. The price is relatively expensive. I recommend Zhongnuo Navigation. The Toyota Corolla is not expensive and affordable, and the quality and sound quality are good.