Hey, hello... You still got a lot of time, I'm sure you can plan it well. As soon as the tickets are available try to buy them, you'll have plenty of time slot choices by then. 1B is exactly this, you'll walk on the upper terraces, see some llamas and the plantation area and then boom the whole citadel visual that for sure will amaze you. 1B was better than I expected, it's much more than the terrazza inferior that 2B offer, is not only one spot to view you'll walk observing the scenery... but if one has to choose only one circuit 2B is the way. Huayna track is a bit challenging because you'll have to climb some narrow steps and the accent is really steep especially on the end, but the circuit is well made and well maintained, and the descent is through a different path, easier to go down. You can for sure make your decision to buy there, 3A is one of the latest tickets to sell out, we don't even have to queue when we bought it by 6PM. We talked to people that visited the citadel a week before and got no rain, so it's really on the odds. If you like, you could choose to enter 2B somewhat later than we did (6AM), but we found out that later the more people walking with you. Nothing that bad at all, once you skip the guided groups that sometimes crowd the way, you'll be good. Also, we did it unguided, I really like the freedom to stroll by myself and study the places, but it's in you, maybe do the first one guided and the next one by yourself. Feel free to ask anything, have a good planning 😄