It's English. But among the two languages in the question, it's Chinese.
According to the link below, Chinese is the most widely spoken language in the world. Spanish and English come in second and third, respectively. French comes as the tenth-most widely spoken language.
Mandarin Chinese is the most spoken language in the world.
Mandarin Chinese is the most spoken language in the world besides English. It is the official language of China and is also spoken in other countries such as Taiwan and Singapore.
Mandarin Chinese is the most spoken language in the world based on the number of native speakers.
Chinese
Mandarin Chinese is the language with the most tones spoken in the world.
In 2014, the most spoken language in the world was Mandarin Chinese.
chinese(mandarin)
Chinese
It is Han Chinese.
Mandarin Chinese is the language spoken by the most people in the world as a native language.
Spanish is currently more widely spoken as a first or second language, but French has close to as many speakers with good proficiency as Spanish.