It depends on how much you want to carry in your bag (if you intend to use this bag for "everything"). Here are the dimensions of the ribera MM: it is approximately 13.5x8x7.5". The size should help give you a better idea on what suits your everyday needs.
Depends on how much you carry. I bought a Ribera MM and returned it for a Manhattan PM b/c it was so friggin' huuuuge! I felt like I was on my way to the airport every time I carried it but maybe it's b/c I was so petite and it seemed to overwhelm me. I think it also depends on your frame. I like the Alma but yes, it is dressier. If you don't mind big bags, then go for the Ribera. I just love the shape but couldn't pull it off.
I am 5'5 and do like big bags-I have an epi,black speedy 30 that I adore, I don't rotate my bags, but do want the damier to wear everyday with my mostly jeans attire as I am a chemist and dress in lab coat daily. I'm really ALMOST SOLD ON THE RIBERIA , PLEASE MORE COMMENTS!
I looove the Ribera Mini but if it is a choice between Ribera MM and Alma, I would say go for the Alma b/c it is less bulky. The top of the alma is quite flat and gradually gets bigger...whereas the Ribera is one overall large piece if you know what I mean. The good thing about the Ribera is that you don't see it often though. The resale is not as good as an Alma b/c the Alma is in higher demand from what I have noticed on eBay.