Griffin Mountain is a pretty great Runequest module as well. It’s really a mini campaign setting though. I’ve always been curious about Pavis and Bug Rubble.
One thing I like about the 1e modules is that they provide for greater player agency compared to what I’ve seen from later editions’ modules. They generally just provide the setting and characters without much plot or railroading. I think the idea that modules could be run out-of-the-box without any preparation, i.e. like following a script, is something that became more prevalent over time. I certainly don’t think many of the early modules were written this way.