I've been going back and forth between the A-series and G-series for our next AD&D fun.
I've basically settled on the A-series.
When I do run the G-series, it will be with the pregrens. But they're quite high level, and I feel like they're a bit overpowered for G1. They also require the knowledge of a lot of spells and tactical uses of magical items that come with experience in AD&D, not just gaming experience.
I think it's easier to get that experience using the A-series. The pregens are lower level, and have a smaller book of spells and special magical items to deal with. The scenarios are a bit smaller, too, requiring some puzzles to be solved and fixed encounters to be dealt with, without the large free-flowing tactical challenge of the high-level fights of the G-series.
My players need to be a little more AD&D experience, I feel, before the G-series will be a challenge instead of a source of frustration.
So I'll be prepping A2, probably, and running that for our next AD&D game. We'll almost certainly do Felltower first . . . but I'm looking forward to seeing how my players handle the A-series.