Your comparison is not fair. I mean S series is the flagship models from the Samsung. S series is pitted against the iPhone. You can’t compare them to any other devices from Samsung. As for J series, it is mid range devices which is positioned between budget devices called On Series and premium range device called A series. If you want to compare, than compare with the last year model or similar priced model. Comparing a 350$ model with a 250$ model will not help anyone. Regards.