i feel like this comes down to whether you want mono or de. i have the delightful and i love it. the strap took some getting used to for me, but i have the mm and it fits over a winter coat, and doesnt overpower my frame when worn without. the slouchy look took some adjusting as well, but when i lay it the way i like it looks gorgeous. i like open top bags, so there isn't an issue with that for me.
the delightful has a zipper, so that might be a pro.
definitely try them on! i love the port but could NOT wear it. tried it more than once. the delightful has a soft strap that is much more comfy. that being said, if i could wear the port i would buy it. i love the look of it but the strap hurt my shoulder a lot. some people also find the handle obstructs the opening and makes it hard to unzip. also be aware that there have been some issues with the port canvas cracking near the strap anchors. good luck, they are both beautiful bags.