I’m happy with my Samsung S3, now that I’m running Cyanogenmod 12.1 on it. With the new OS, I don’t have the storage issues that came up with KitKat, but I still haven’t found anything to match the functionality of “Priority Senders” in Samsung’s email app (not for trying, I even tried loading the Samsung apps on Cyanogenmod, but they need Touchwiz to work!)
I received a Samsung S5 in mint condition, with the issue that it’s rom-locked and won’t boot. I’m playing now with Cyanogenmod ROMs and vanilla Samsung ROMs trying to get it to work. Lighter than the S3, with a 12 megapixel camera, faster CPU, sharper screen and support for 128 GB micro-SD cards, it’s a worthwhile exercise to try and revive it.