Honestly, I wouldn't recommend the smaller size on the Original Cologne - maybe for a collector, or somebody who has a ton of colognes, but not for somebody who planned to use it a lot. It really is a cologne, and you need to use it as such, IMO. White Flowers is pretty potent stuff - 1 oz will last a lot of people a long time, if it's not their go-to perfume. But I can use 1 oz of a standard eau de cologne pretty damn fast.
Is there any chance that they'll drop the 75 mL format for Royal Oud any time soon? I hope not - that's a great size.