I feel like in terms of travel, the compartments and durable canvas exterior of the Pochette Metis would suit best. I really love the organization of it.
However, I really do love the nude Marmont (was considering getting one myself)! It just seems like it'd be more prone to scuffs and colour transfer.
Fellow mom here with toddler and newborn on the way. I have the Gucci soho in black, beige and red. I have experienced some color transfer with the beige, but I was able to get it out with leather cleaner/conditioner very easily. The black has had no problems. The pebbled leather is beautiful and soft. (It smells divine when you first take it out of the box! #weirdtendencies). The bag has one large compartment on the side, where you could tuck in your passport, and another little compartment attached to that pocket, which may or may not fit your phone depending on which model you have. It holds quite a bit and is carefree. I do think black is practical as it will be more resistant to any dirt that could reside on security check baskets/belts, overhead compartments, etc, etc. It's also light weight and a nice length to wear cross body. I am 5'4 and it hits me below the waist when I wear it over the shoulder. I just haven't bothered adding additional holes but I will come around to it some day. I like the nude Marmont, but I fear it won't be as classic as a design as the Soho.
I don't own the Pochette Matis, so I can't attest to its practicality in terms of travel. LV canvas is quite carefree though, so that's always a huge plus! Just depends on your average travel wardrobe I guess, and how easy it would be to match.
Let us know what you decide!
Looks like Black SoHo Disco and Pochette Metis are both good options! Wonder if PM can be a work bag as well. Currently I only use totes/satchels as work bags, but I don't carry much (a card case, coin purse, cosmetic bag, cell phone, car key, a pen and flash drive). I will swing towards PM if can be used as a work bag. May consider getting a black empreinte!