ssiddharthI Won't Download Your App. The Web Version Is A-OK
Web browser is a sandbox by default. Worst a sketchy site does is eat a tab, less if you run an adblocker. Native app? Background processes, hardware ID shenanigans, your contacts, location. The whole buffet.
Apps have to request your permission for contacts and location. iOS is really good about not giving bad permissions to apps without user being asked for consent.