Is the iphone X charger you used an Apple charger? If so you will be more than fine. If you want a new charging brick, go with Anker. I've had many of their stuff and never had any problem.

Don't use whatsapp so idk how they work as far as settings and backup go, but most other things can be backed up to Google Drive/Photos if you are okay with using Google. Once you have your iphone just download Gdrive and Gphotos to retrieve your data. Not sure if your contacts would transfer but you can always manually add it to your iphone before resetting your android.

Whether or not it's worth the transition is up to you, you decide what's worth.

I think the better questions to ask yourself is can you afford the upgrade, and is the defect preventing you from using the phone in any way?