I think the Tivoli is much prettier but the Galliera is more practical and easier to carry on the shoulder if that's the main reason you're looking at the of them.
Galliera for sure. I have had both and they dont compare at all. The tivoli is bulky and not a good shoulder bag. It feels very odd/uncomfortable to carry. Galliera I forget I am even carrying it! I love the slouchy look of it too.