I hear everyone on LMoP, it’s a very well structured adventure and it showcases a good breadth of baddies that have a reason to be there. It is a great introduction to a bunch of standard DnD tropes, but it’s also trodding very well worn ground. It’s basic DnD done right, but…i guess, yes, not everything has to be new and exciting if it just works.
No one has yet really gone to the stuff on DM’s guild, so I will. With my sole nomination.
The Collected Works of MT Black Volumes I & II. I guess that’s two products. There’s better production value in Two, and it has more stuff over Level 5, but One has more adventures you can link into mini campaigns. Overall, while they’re just one shots, they are far more imaginative and interesting than just about anything the Big Books have. A tremendous value and easy to run right off the page. West Marches in a box that is a pdf. Great intros to SKT or PotA if you’re not impressed with the get to level 4/5 intro stuff those have. Side quests any time. If we’re talking things people should run, should experience in 5e, these are some of the best little set pieces out there. Cheap and quick reads too if you doubt me.