Between these two however I'd go for the Saxonia Mondphase. If I would take an 1815 in this price category (€ 20.000 - € 30.000) I'd go for the 1815 time only. This breathes A. Lange & Söhne from every pore, so to speak, without the dial cluttering two subdials. An 1815 Chronograpph is of course another ballgame, another league wikth another pricetag.