The Galaxy S6 active matches the standard GS6 in many ways, and even bests it in some crucial areas.
The quick take
The Galaxy S6 active takes a proven great device in the Galaxy S6 and beefs it up just a tad. Metal and glass are replaced by rubber and plastic, giving the GS6 active water, dust and shock resistance while only adding minimal thickness and weight. The extra space also gives the active a dramatically larger battery, which fixes one of the main issues with the original. You’ll lose a fingerprint sensor and some of the sex appeal of the GS6 if you choose to buy an active, but the only real downside to be found here is that the phone is exclusive to AT&T.
Source: iMore