Ohhhh that's a tough question as they are both fabulous. I believe the Gucci Disco bag is more compact and carries your basic essentials. It is still very roomy and looks nice. The embossed GG logo makes the bag more of a statement too.
The Celine Nano is slightly larger and can fit a bit more. I like that it can be handheld or used as a shoulder or crossbody bag. But the Celine is a lot more expensive i believe. If i had to choose, i would buy the Celine Nano because i like it's minimalist look.
I have both styles and think both are great for different reasons but the Nano is one of my absolute favourite bags.
The Gucci is a good day into evening option whereas the Nano probably works best as a day bag.
For nano which leather is the best? Pebbled or smooth leather? Is the smooth leather is prone to scratches?
It depends on if you want silver or gold hardware. The silver hardware is paired with pebbled leather, and the gold hardware is paired with the smooth leather. Tbh when I try on both leathers, I don't find a huge difference.. So i would go with whichever hardware you use more
(also i have had the smooth leather in micro and it hasn't gotten many scratches)