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I have the decathlon tent. It's ok. It's almost doubled in price from when i bought it a few years ago, so it may not the bargain that it used to be. It is quick to pitch and has never let me down, but is far from perfect. There are plenty of reviews on the decathlon website, and on youtube, about it's strengths and weaknesses. I suggest you peruse those thoroughly before you buy one.
It is 1.5kg and packs down to 32cm x 15 cm (L x D)
I did look at the Lanshan 2 pro but the only one I could find needs hiking poles to keep it up. Unless there might be another model I cant find? https://www.decathlon.co.uk/p/2-man-tunnel-trekking-tent-mt900-ultralight/_/R-p-323505?mc=8586318 also another strong contender.