I don't use that mixer/recorder combination, but I do have both the Petrol 602 bag, and the PortaBrace AO-2XB.
I bought the AO-2XB because I thought I needed a bit more room in my bag (for that ever expanding number of receivers!) and I've since reverted back to my Petrol bag.
The AO-2XB is nice and big and is constructed with really strong Cordura nylon, but the pockets in front and on the sides, were too big and things would always seem to get lost in them. I know you didn't mention black as a colour specifically, but the black interior on mine didn't help with finding things. There were some clever holes where you needed them for cable routing etc, but overall, I found the bag much too rigid, and it always felt like I was wearing a milk crate on my chest. As well, if you plan on using a harness, the rings to clip onto are mid-bag so you have to really get over on top of it to be able to clip onto the bag. Always a bit of a struggle.
Can't speak for the other Porta-Brace products like the 1.5... haven't tried them, but the Petrol bag, on the other hand, seemed a bit more flexible and adaptive for me... orange interior, so easy to find all the bits floating around your bag. Like the clip-on transmitter holders on the sides - keeps your transmitters status visible at all times. Easier to clip the harness to.
Cheers,
Rich