First of all, it should be said that the two brands were controlled by BBK in the past, but due to internal reasons, the subsidiary OPPO was separated from BBK and existed independently, and the relationship between them was mutual reference.

Oppo was first founded to take the high-end route, and vivo was later founded by BBK CEO to take the low-end route.

Oppo and vivo are both brands that have transitioned from functional machines to smart machines. In product research and development, the two brands have different understandings. Oppo adopts the development trend of the times, and its products show the mainstream configuration, without the design concept of special configuration. Keeping up with the market development trend is their consistent research and development strategy.

Vivo has taken a completely different research and development idea from oppo. Vivo has always been committed to differentiated research and development ideas. Vivo pays more attention to functional research and development and user preferences, and leads the industry development with advanced technology. It is not difficult to find the products of vivo. Judging from the SRS sound effect of the first generation smartphone vivoV 1, every mobile phone of vivo has the function of leading similar products.

In terms of taking photos on mobile phones, vivo is the pioneer of the front dual camera, which can be said to have created a new era of mobile phone selfie. Oppo and vivo focus on camera function, and their latest two models are dual-camera mode.

This answer applies to all OPPO models.