Both have 6.5 inch super amoled display which supports 90 hz of refresh rate. Both can stream 1440 content on YouTube and non of them supports hdr.
Battery
F 15 5g has 6000 mah (approx 12 to 16 hrs of Sot) massive battery but A15 5g has 5000 mah (about 10 to 12 hrs of sot). And charging speeds are same i.e 25 watt.
Performance
Both have same chipset ie mediatek dimensity 6100➕️ which has antutu about 4 lakh in Both phones . Performance in terms of gaming is better in F 15 5g because of 6000 mah battery. ( performance is an overall aspect of battery and chipsets).
Camera
Both have same camera setup 50+5+2 in rear and 13 megapixels in selfie . However camera optimization is slightly better in a15 5g.
Design
Both of them have same design with key island .
(Note ===== Ui performance is better in A15 5g because it's ui is better optimized and it also supports AOD Which is missing in F 15 5g)
If battery life is priority and you can manage slight lags then go for f 15 5g but if you want fast and better ui ,and better camera optimization go for A15 5g.
