Whatsapp Plus is Modified Whatsapp Version,I am using it for many years & I Don't think it steal your data. Is is one of the best app. Look below extra features of Whatsapp Plus:

Change the colors of the interface or the size of the fonts to your own liking.
Send large audio and video files.
Download or send photos with their original quality.
Quick sharing functions.
Partial copy and paste: select part of the text you want to copy and paste and send it to your contacts.
Hide your profile picture.
Check connection times and statuses from the chat screen.
Install different themes.