Second handed ~400€ camera? Sony A7 I vs Lumix GX80?

Hello everyone! It has been a long time since I wanted a camera and I've been looking for deals in second handed websites. I found a Lumix GX80 in 230€ without the lens, or 300€ with a 12-32 lens that I think it's not so useful for the use I want, so better without the lens? There's also a Sony Alpha 6300 with a 16 - 50mm in 370€ and a Sony A7 in 250€ without the lens. Which one of my options is the best in your opinion, or do you have another suggestion, maybe of another brand?

Thanks!!

(1) Budget, country, and currency: $300-400€, France

(2) What equipment, if any, you have now and why is it no longer meeting your needs? I do not have camera equipment, previously I've used Nikon cameras.

(3) What kinds of subjects do you intend to shoot? I'm looking for something versatile. I need to shoot objects in interior -violins-, but I want also nature and wildlife. Also, if it's possible it would be nice to record video as documentary.

(4) Is it primarily for photography, videography, or both? Mainly photography might want to take videos but not as important as photos.