Should I buy a used Panasonic ZS100 or a new Canon V10?

The choice mostly comes down to whether you want a compact travel zoom camera or a new camera made for vlogging.

Choose the used Panasonic ZS100 if you want a travel photo camera.
The ZS100 is a classic compact camera with a 10x zoom range (25–250mm) and an EVF, which is very helpful outdoors and in bright light. It also has a 1-inch sensor, so it can deliver solid image quality for a camera this small. The tradeoff is that, as a used camera from an older generation, you should expect no manufacturer warranty and should check shutter count, lens condition, and battery health carefully.

Choose the new Canon V10 if your main goal is vlogging or casual video.
It’s the better pick if you want a new camera with a warranty and you care more about video-focused convenience than zoom photography. Compared with the ZS100, it is generally the less flexible choice for traditional still photos, especially if you want optical zoom for travel or distant subjects.

I can’t confirm every V10 feature here, so treat it as a video-first compact rather than relying on specific extras. If your priority is still photos and travel versatility, I’d lean ZS100. If your priority is video and you want something new and simple to use, I’d lean V10.