the 920 is a great phone, more internal storage ( very important for apps and games ) and has built in wireless charging, the 925 is an overall better phone than the 920 so consider the minimal cost difference between the two phones, you said it was for a family member, so i would suggest that you examine the likely usage pattern of said family member and that should help you decide, if its for a younger kid, apps and games might be a higher priority for them, if for an older teen, music, videos and photos might be more their thing, which can go on an SD card, either way as far as OS functionality goes they are equal, either way you cant go wrong, also don't get caught in the trap of "the next phone coming out" for this will always be the case even if you just bought the newest best phone available, the advantage of WP OS is the OS's continuity between devices