Thanks for the replies, now that I see them side by side in the pics I think I like the Gucci too. I also prefer the antiqued gold colour of the hardware on the Gucci compared to the yellow gold on the Mulberry.
+1 for the Gucci. Most likely a better investment, because Mulberry quality hasn't been all that great lately - neither leather or hardware. Plus the M is so boxy I don't feel like it would make a nice, laid-back companion for evening outings.
I tried on the Gucci today in Harrods and it didn't feel right for me, I don't know why. I didn't like the Mulberry . I did try on some Dior Wocs and really liked them. I may stick to buying an LV empreinte bag and also a Dior woc or LV Felicie after that. I ended up using some Harrods rewards points towards an LV empreinte zippy coin purse, my first Empreinte leather piece and I love it.