Better amongst the both will be Lava Z80 because of the better camera, bigger battery, newer software. To check all the other details of the device comparison use this link: Lava Z80 vs Gionee F103 3GB RAM
Note 3S is better than Gionee F103 as it has Around 50% more RAM than Gionee F103. More RAM means more applications can run at the same time, which makes the device faster, and Around 10% bigger screen than Gionee F103. Reading, browsing the internet and watching movies is more pleasing experience on a bigger screen.