So my a15 was the worst Samsung phone I have ever owned it was laggy all the time getting hot it finally just quit working so I went and got the a25 and so far way better performance working like a phone should we will see as time goes on
That's because the A15 is the most basic of smartphones. It was never really meant to do much but be a phone with web access and some extras. It's a starter phone. If you were using it for more than that, then you bought the wrong phone. If budget is a consideration and you need to do more than the basics, always choose the middle option.
I honestly love the a25 better than the s24 ultra never had a bug or issue sturdy phone not easily broken has a lot of storage and developer settings work great. No technical issues either. Only thing the ultra has that I enjoy is the camera quality. Don't think I've had the a15 but I don't even feel the need to upgrade from the 25 at all. Has everything I need and then some. Plus I work from my phone and the processor is great! Never had any issues live streaming my security cameras or anything like shutting down due to over use and rarely ever gets hot from constant use from 24/7 monitoring cameras for 6 hours straight
