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The lanshan 2 pro is bigger as it's single skin with bug netting only where needed. This gives you a bit more space.
It sounds like you can get a bit of condensation, but this will be twice as bad with two people in it. Solo, I'd have though the bigger size would mean less than condensation than the lanshan 1 pro / six moon designs version.
I'm umming and ahhing about getting the 1 pro as I type. Only about £100 at the moment.
And that's where the hidden constraint comes into the picture, don't think the budget will stretch that far. And based on that review the Lanshan 2 is not going to cut it.