There is nothing in the world that would make me see the two watches under discussion as comparable. The Lange 1 has a degree of relevance in horology that the PanoR does not. The Lange 1 is the watch that put ALS "on the map." The PanoR has no such significance for GO.
As watches worth buying, either is fine, IMO, from a curatorial collecting standpoint as both makers, along with Nomos, Tutima and a few others reflect the reemergence of fine watchmaking in Germany, which occurred after the fall of the Berlin Wall. Make no mistake, however. The ALS we have today, even though it is partly led by a Lange family member, is not at all the same ALS that Ferdinand Lange created in the mid 1800s. IMO,
if one is looking for a GO watch that's comparable to the Lange 1, it'd be the Senator Perp Cal. Why? It's the watch that put GO "on the map."
Just looking at the movement, there again isn't much cause to choose the L1 over the GO PanoR. They both use 3/4 plates that leave little to see, and what one can see of the remaining sliver of the movement is beautifully decorated and executed on both watches.
Technically, I know the L1 is implemented with a jumping date rather than a slow rolling date change. I do not know if the GO has that same functionality. There's little question that the jumping date is the more elegant and technically refined implementation of the date complication. Certainly if that bit of niftiness is critical to you, then by all means get the L1. If it's not, you're pretty well left to buying it based for self-indulgent or styling purposes. Nothing wrong with that, just be sure that you're clear in your own mind that those are the factors that drive the decision.
Personally, having the ~$20K to buy the L1 isn't point; I suspect few are the folks who would argue that a jumping date is, in and of itself, worth $20K more than a rolling one. However, there may be some people out there for whom various engineering implementations of date functionality is the thing around which they are building their collection. For them, I am certain that the "jump" would be worth $20K if that's what they have to pay to get it. If you are one of those people, well, you know what you have to do.
Now if what you want is an uncomplicated watch that has power reserve indicator on the dial, well, the GO PanoR fits the bill just as the L1 does. Were that, instead of horological relevance, the primary driver to my planned purchase, I'd absolutely get the GO, mainly because I don't see much point in spending nearly three times as much when I don't really give a damn about the intangible factors that in part contribute to that bump in price. Plus, the price differential is going to manifest itself not only upon purchase, but also for ongoing maintenance. To what end would I pay more to buy a thing, pay more to maintain the thing, all the while not giving two cents about why the L1 is important?
Aesthetically, I think the GO PanoR with a black dial looks better than the L1. With a white dial, I like the L1's looks better.
All the best.
Far be it from me to ever let my common sense get in the way of my stupidity. I say we press on.
― Sherrilyn Kenyon,
Infinity