We did a drying room and used the hose drain through the wall and to the outside. It’s only a little drip drip drip so doesn’t need to be connected to a drain and means there isn’t a tank to empty
When I looked at this recently I thought that the units with a higher "litres" rating still had the same tank volume. So, I figured the rating was about the rate of moisture extraction.
I also concluded meaco, specifically arete two. Haven't bought yet though.
Final question - is the only advantage of higher litreage less frequent emptying/greater ability to be left to run whilst you're away? Cheers