Second hand gravity dropper. Ok it’s all clunky with springs cables and magnets, but it rarely needs servicing and even when it does, you can strip & rebuild it in 10 minutes. Take that, hydraulic air spring posse.
I have had my GD several years and it gets all the winter riding abuse. I have broken it twice: once the remote trigger, and another time I snapped the inner post because I had mounted it wrong way round with the holes facing forward not backward. In the latter case I had to pay £40 for a new inner post shipped from the US. Replaced in 10 minuted once it arrived.
Most common service needed is a 30 second adjustment of collar tension, and once I’ve installed new plastic thingies that stop it rising all the way out. I forgot what they’re called – they’re not expensive though.
Have also owned both reverb and ks (neither in 27.2) and they are both less reliable and harder to fix.