I have both and in those sizes.
Bolide good for:
Work, daily & travel
Nice shopping OK, but not groceries or chore/high-street shopping. The opening of a Bolide is a one-way zip and doesn't open all the way down the sides (some brand''s dome bags do) Although you can leave the bag unzipped and open and have it somewhat filled beyond what it holds zipped, overfilled, and you'll be pulling the handles together whilst forcing the 'wedge' open with stuff.
Closed and zipped it becomes very smart, bonus when you need that kind of look for work or occasion, and plus you have a nice strap.
GP good for:
Work, daily, travel & shopping - but it has a more casual vibe even if both in a more 'casual' leather. People obsess over a strap, but you wouldn't want one, nor the rolled handles over your shoulder, the bag's too wide. It's very strong though and can hold a lot, very good for a travel bag. You can buy a base or make one, and in VN the bottom doesn't really sag. No feet though (if I put it down, I put it between my feet (I try not to put any of my bags on the floor anyway, not even if they have feet).
They're both great and would equally make a great everyday bag.
What do you think of rouge casaque bolide 35