Having slept on it and caught up with all the arguments for various I still gotta say I'm leaning Bespoke over everything else. We came here because we wanted to teach a few of the locals, and I really want to take advantage of being able to completely customize the design of our museum. Plenty of room to expand freely is just icing on the cake.
Imagine having our massive collection of forbidden lore, dark grimores, and forgotten history be in a comfortable, nice, and well-lit building? An extremely welcoming museum accessible to all who want to come by and learn from Uncle Liche Priest, who'd just love to teach you for the sake of it.
Also frankly, I just want to run a cool undead museum on the Vampire Coast, not go globe trotting. Leviathan is the worst of all of this for me, sacrificing both space to actually store the shit we're given to hold on to and being less easily welcoming do to making people walk in through the teeth for unparalleled mobility I personally don't care for.