Versus and Its Abbreviations v. vs. vs v

Sources:

https://www.dailywritingtips.com/versus-and-its-abbreviations/

https://english.stackexchange.com/questions/5392/how-should-i-abbreviate-versus

https://www.btb.termiumplus.gc.ca/tpv2guides/guides/wrtps/index-eng.html?lang=eng&lettr=indx_catlog_v&page=9GZGCGS05v7g.html#:~:text=Versus%2C%20meaning%20%E2%80%9Cagainst%2C%20opposed,in%20legal%20documents. 

<<There are 4 types of abbreviations I know for "versus":

• v
• v.
• vs
• vs.

I generally use the last one in the list, but I want to stick to one and use only that one. Which one is more proper (or more prevalent), and why?

Extra question: Which one should be preferred in scientific papers?>>

<<Versus, meaning "against, opposed to" or "in contrast to," is often abbreviated to vs. in sports coverage and to v. in legal documents.>>

<<The word comes from the Latin verb vertere: "to turn, turn back, be turned, translate." Versus is the past participle of vertare. Its meanings in English include "against" and "as opposed or compared to">>

<<In legal contexts, the abbreviation "v." is used. Elsewhere, the most common is "vs.". In formal contexts (e.g. scientific papers), it is probably best to have the period at the end of the abbreviation.>>