Well, it depends on what you need the bag for. The GST is a great everyday bag and has lots of room. But the timeless tote is a little more fancier. I like the GST because I can put some stuff for my kids if I need to. Like toys or a snack and have another pocket for me. Then it has a zipper pocket for my keys and wallet.
The Petite Shopper holds a lot and depending on what you're wearing it with, it can easily go from casual to dressy.
I take it on casual outings with my son and I've taken it to dressy brunch with the girls.
When I'm out with my son it comfortably fits: wallet, cles and keys, 2 pull ups, travel wipes, hard case for sunnes, small digicam, cell phone, ziploc with snacks, small bottle of water.
Room to spare.
I have both and i think the ladies have said it all.
Petite shopper is more dressy, goes from day to night. its also by far LIGHTER than my GST.
I also prefer the zipped factor.
The GST is too open and things end up all over my back car seat... but they are both nice bags. Get both!