Tapatalk has had issues with security.. My vote would to be go with a vbulletin app like another forum I frequent has (homebrewtalk.com). Imo, the app is better than Tapatalk.
Its a app developed by vBulletin for the forums, should just be plug and go. I assume there are some sort of customizable parts though. Many forums have the same deal. Each forum has their own app.