The latter is faster.
VOOV flash charge is a low-voltage fast charge. Use low-voltage flash charge, quickly restore the phone's power in a short time, and charge more safely. A flash core. VOOC flash charge is different from general charging, it imparts a micro smart chip \"flash core\" in the power adapter, the flash core intelligently regulates the current, intelligently identifies the flash charging conditions, improves the charging efficiency, and reduces the heat of the mobile phone when charging.
Dual-engine flash charging technology is similar to OPPO's VOOC flash charging technology, which belongs to \"high voltage and low current fast charging\". The use of dual charging chip and dual charging circuit brings twice the charging speed of ordinary mobile phones. Charging speed is not as fast as VOOC flash charging technology.
Flash charging is four times faster than normal charging, while twin-engine flash charging is twice as fast.