IDK about being the best, because I haven't played 90% of them yet. But, my group has always had fun with DM Dave one-shots from the Roll20 Marketplace. We have played through at least 2 of them, both were good. And DMDave has an index of one-shots listed by-level on their Marketplace profile page, <a href="https://marketplace.roll20.net/browse/publisher/497/dmdave" rel="nofollow">https://marketplace.roll20.net/browse/publisher/497/dmdave</a>
