I researched movements-updates and the likes the best I could. Spoke to some Lange experts.
In the end, the sense I got was preload or not made little difference. I even heard one expert claim the Lange folks told him the earlier preload models are thought to be a bit more robust…
In the end I found a lovely example from my favorite dealer. That was probably the most important part.
It has preload, but after all of two days, I fail to see what the big deal is. Barely perceivable to my eyes.