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As a player we enjoyed the first half of OotA, but we decided not to attempt the second half as our DM was not enthusiastic about it. As a DM running DIA I think the adventure is a solid B.
One thing DIA has going for it is that since it is a newer adventure it has much better community support...
Storm King's Thunder is probably the simplest official module to turn into a sequel. One of the starting towns in chapter 2 (Triboar) is very close to Phandalin, you just need to insert a plot hook to get your PCs to the next town over. E.g.
I'm currently near the end of DM'ing one SKT campaign and I'm about to start another, so I have some thoughts I can share.
The book (and Roll20 module) does technically contain everything you need to get players from level 1-11, but there are some major caveats. The level 1-5 adventure is very...
D&D Beyond has a searchable Index of all the official 5E monsters. You can view the name, CR, type, size and alignment for free (you don't even need an account). If you want the actual stat blocks you need to buy them.