I have both Totally MM and NF MM. Every one has given you a valuable opinion, but I want to add one. NF can hold much much more than Totally, because of the open top. In my opinion, NF MM is comparable to Totally GM in term of what can you fit inside.
I had Totally GM before and that is the best bag ever, but the stitching got loose and the LV gave me credit note (even after more than one year of purchase, unfortunately by then the Totally GM has been discontinued, otherwise I will get it again).
Mind you I am a mummy of 3 young children, so I need to bring a lot of stuff. My stuff are:
- LV long curiuse wallet
- Changing mat
- LV GM pouch consist of 2 nappies and plastic bag
- pack of tissue
- iphone 5
- cosmetic pouch for creams etc
- Wipes
- books for my shopping cards
Those can fit in both bag, but very tight in Totally MM, and I cant use the outside pocket since it become very tight, but with NF, I can still add ipad air, snacks, and water bottle.
So it is depends what are you going to bring in your bag, the city where you live and your life style (how you commute, the weather, public safety, etc).
But both are beautiful. HTH