I have this one. I can carry my phone, a small wallet, sunglasses, and a few other small things and it's not packed full. I like it because it is so light, and the leather is soft. You can adjust the strap length (or remove the strap) by re-tying the knots inside the bag.
I think the biggest factor would be whether it's big enough for what you want to carry. And if the back zipper annoys you. I'm ok with it but I wish the zipper was a bit smoother to open and close. Overall I like it because it feels so weightless, holds my basics, and I like the way it looks.