What is the best technology to build mobile applications now-a-days?

• it should be Android and iOS
• it should be able to access contacts
• it should be able to access camera pictures
• it should be able to do background work (cync contacts and pictures)

Nominated technologies I know are:

• Android / iOS native apps (cons: two developments)
• Web App (cons: it lacks capabilities)
• Cordova Web App (cons: it lacks communities)
• React-Native App (cons: it lacks Android features)
• Others