I love both! I love the way the larger duffle falls slim against the body when not too full...not bulky at all despite the oval shaped bottom--which I love btw~! I love the leathers on these bleekers-- thick and great quality just like the older original classics back in the late 80's and early 90's!
I love large bags so love the large duffle...works as a snug crossover too which is cute...esp. in the warmer weathers when you're not wearing a thick coat.
The smaller duffle I love too because you can wear it two ways --as a shoulder bag with the strap doubled up or wear it as a nice long sling/crossover purse. I got this in the ink-- the ink is so gorgeous in real life. Mine is more grey than blue and is pretty much a smokey charcoal blue color that is just gorgeous!
If u like larger bags go for the large duffle and if you want something that is versatile and can be worn in different ways, go for the smaller one, which will still hold a lot as someone above mentioned.