There are certainly some reasons to opt for the Phantom 4 Pro+. Production companies that don't want to have a smartphone or tablet dedicated to each member of its Phantom fleet are certainly candidates. But for the average user who already has an Android or iPhone in their pocket
Long-distance control; Return-to-home; Forward and rear obstacle detection; Automated flight modes; High-performance Sport mode; 24mm lens; Subject recognition and tracking; 60fps 4K video; 20MP Raw and JPG images; 1-inch sensor camera; Remote with integrated tablet
Expensive; Side sensors limited in functionality; Integrated tablet suffers from occasional crashes and slowness; Maps only visible if preloaded over Wi-Fi