You asked
Fujifilm x a3 vs sony a6300?
The X-A3 and the a6300 are very close on paper. Both have a 24.2-megapixel APS-C sensor, both were announced in 2016, and neither has stabilisation in the body, so you'll want stabilised lenses for slow shutter speeds. The real difference is the mount: the Fujifilm X-A3 takes Fujifilm X lenses, and the Sony a6300 takes Sony E lenses.
If you're going with the X-A3, I'd start with the Fujifilm XF 18-55mm f/2.8-4 R LM OIS as an everyday kit lens, and the Fujifilm XF 35mm f/2 R WR for a small, sharp prime.
On the Sony side, the Sony E 18-55mm f/3.5-5.6 OSS is the simple kit choice, and the Sigma 18-50mm f/2.8 DC DN Contemporary is a bright standard zoom if you want more light.
My honest take: the sensors won't separate them, so pick the mount whose lenses you like the look of.
Written by Claude from this site's pages.