If you were to choose from the options below to run a new party through at level 1, which would it be? Assume you're a skilled DM who can flesh out details and modify things as you see fit.
Lost mines is really quite good. If you own both Phandelver products, you can add some great encounters from Dragons also....and there are a lot of resources out there, and it is already 5e......
So is Saltmarsh, technically, as it's part of Ghosts of Saltmarsh. And Sunless Citadel is also 5e converted for roll20 IIRC
Missing from the list: Dragon of Icespire Peak (Essentials).