It probably depends on how you want to use them. I’m still not sure myself, I’ve entered them in different ways because it’s not yet very clear to me how the embedded search will work in its final version.
My personal opinion for a best practice is to make individual atomic notes for each and tag them in ways that will allow you to aggregate them to your preferences later. Potential tags are a quote marker (#quote) and the author (#AbrahamLincoln) so you can at a minimum aggregate to an author page. Or make an author page ex. [[Abraham Lincoln]] and backlink all to that. Additional tags for topics may add value as well, some will likely suggest topic pages (aka MOCs etc) but that feels very frictional to me for quotes.
I’ve been using Obsidian since very early on and saving quots but am still not sure what my final best practice will be…interested in how others are doing it at this point.