It's a style question far more than a functional one. They both offer protection.
Given it's a vintage vehicle, I'd opt for the OE fuse holder to remain in place, and have separate fuses for the add on devices. Those items would be suited fine for the blade fuses, and locate them near the device being protected.
You mentioned its a custom ride. Based on that route, I'd pivot, and go for an updated blade style fuse holder and locate that as you see fit, perhaps even in a similar mounting position/location (trunk floor) that the bug comes with stock. Then, having a laminate fuse chart in the cubby hole, would help you, or the next owner on the purpose of each fuse.
A third option, is the later model bug fuse holder with many more spots. Those took 8 or 16amp ceramic fuses, and while not pretty, they were functional. The block also came with a plastic window for protection from bumping from the underside of the trunk. That option might require some metal work to fit.
Kludgy. That was a descriptor I used often, but it's fading fast.