Neverfull! You can fit so much in that bag its unbelievable. The strings on each side of neverfull is use for adjusting the bag. Very unique idea . I think the gm would be great for u since you have a baby
I use the saleya MM when I have my 15mo old by myself. I carry only a sippy cup and a bottle of apple juice (in a ziploc) and a diapee wipee case with one or two diapers in it, depending on the length of trip. I prefer it over the neverfull - which I don't personally own, but my best friend uses one and I've used hers a few times and I prefer a zipped top with all the baby junk.
I carry all the "extras" in a backpack in the car, for emergencies. So I carry the essentials with me in the saleya. It also holds my groom wallet, pouchette, cell phone and keys and with the lighter interior (b/c I have the azur) its great, I can find everything really quickly. I'm really glad I got it. It fits great over my shoulder even when I'm carrying my son around.
My vote is for the saleya, hope that helped a little.
Good luck with your decision, I think either back would work great, just depends on your preferences.
I have a Saleya PM and I love it! That size does not work as a shoulder bag on me (it does for others, however). Maybe a larger size Saleya would work for a shoulder bag. For the amount of $$ spent, I think it's better to have a zip top bag...
I would prefer a saleya over the neverfull. I just like the overall look of it better. It seems more substantial. The neverfull looks like a nice beach bag.