I've just returned from 3 days in Dartmoor using a Lanshan 2. Was very windy but I had no problems with stability or condensation. I've modified mine a bit with extra guys and bungee cord though after a disastrous night in the Brecons. See longsufferinghiker on YouTube for a good overview of the tent and sensible mods.
Have a lanshan 2, it's great. Works fine. Only issue I've had is getting enough tension in soft ground with the supplied pegs. But easy solution bigger pegs.
If you are not set on freestanding, there is always the 3F UL Gear Lanshan 1 or 1 Pro. Lighter and better than anything else in the category under 300€. I love [my 2P ](https://imgur.com/a/CV8BqzE) and cannot recommend enough. Over 300€, the Durston X-Mid 1 would be a great choice. Both brands ship internationally.
I also noticed that you mention the warmth of your previous tent. Tents in general don't usually add a lot of warmth, your sleep system should do that. Make sure that your sleeping pad has a good R-Value and your sleeping bag/quilt is Comfort rated for the temps you are expecting. A lot of manufacturers use the Limit or Extreme ratings for marketing purposes or don't get their pads ASTM certified.
I live in a similar climate and use the regular Lanshan 2. It works well, especially for the price.
I recommend against the 4 season - it'll be too hot for most situations. The choice between the regular and the pro just depends on how much you value weight savings.
In a humid climate you're going to be dealing with more condensation. The double wall of the regular lanshan helps manage that. The pro will handle it less well, but you save some weight as a tradeoff.
I have the lanshan 2, regular version, and I live on the west coast of BC in Canada and am regularly tenting where it is raining all night every night. I've been through a typhoon in that tent and it did great. I've used it maybe 400 nights total and it has no issues and has never leaked.
I would definitely follow the advice others gave you and not get a single wall for a super wet environment. Especially a tent as small as the Lanshan 1. I think you and your stuff will get damp every morning. The double wall has done right by me, though.
I would get the regular 3 season Lanshan2. The regular comes with the seams already sealed with tape while you have to do that yourself with seam sealer on the Pro. We also like how we can each carry half of the weight of the regular model. One of us carries the fly and DIY polycro groundsheet while the other carries the inner and pegs. I also think that the separate inner and fly handles condensation better.
Wife and I have one. We used it on the PCT and it was awesome no matter how windy, wet or cold it was. Here are [some pics](https://photos.app.goo.gl/Pdqj4G2SRYgBHrfh6). Only thing you need to do is silicone a couple of the pull outs that have stitching through the material. You can see one of the sealed pull outs in the second album photo (link above).
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