First button would be my choice. Just to be safe.

wear one

You don't risk anything by wearing it. Wear it all please. Don't be fool.

Too many health issues with wearing one. They cut off your oxygen and make you re-breath carbon dioxide. People pass out from this and die from outside things (like passing out while driving).

You can't prove what you are saying.

It's been proven already. Many people have done the test with the OSHA approved carbon dioxide testers.

Please post the link of that.

https://jennifermargulis.net/wearing-mask-can-harm-your-health/

The source doesn't seem very reliable

Check this:
https://www.bbc.com/news/53108405

This link about studies how does facemask help:
https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(20)31142-9/fulltext

The source I provided cites several high profile scientific studies.
The study you provide literally says there is little or no difference unless you use an N95 mask and eye protection.

You did not read it well:

"[...]our findings suggest that N95 respirators might be more strongly associated with protection from viral transmission than surgical masks. Both N95 and surgical masks have a stronger association with protection compared with single-layer masks[...]"

Single layer mask are basic t-shirt made type masks.

Check this:

This is a mathematical model based on casuistry where it is seen as the use of masks used massively, comparing different areas, cities and countries has been done and not. Mathematical models do not usually fail.

https://www.sciencedirect.com/science/article/pii/S2468042720300117

It's a bit long, but I can assure this is very reliable. Check the graphics.

That is a population poll. It does not rule out causes from other sources like different reporting methods and more testing. For reference:

Most people aren't wearing surgical masks.