^ well, with that in mind I would say go for the pochette. I just returned from Kuala Lumpur which is a pretty safe city; there is some pickpocketing but nothing on the level of major South American cities. I took the delightful, Cluny MM, pochette and favorite. The favorite was really unnecessary and I wore it basically only to hit the breakfast buffet and to go to the club lounge--completely unnecessary--I packed it as an afterthought and regretted it. The pochette would have done just as well. The only reason I didn't use the pochette was that I always use it for passports and travel docs and I was too lazy to take those things out and just shoved it in the safe. I used the Cluny for my meetings and shopping and I wore my delightful for a couple of business meetings that required me taking my Nikon (which weighs far more than I would like).
Alternatively, you could go for the twinset and have the best if both worlds plus a bit of added room. Oh, I also took my newest travel buddy, a Ferragamo crossbody Fiamma which has a zipper and a very secure flap which comes up over the zipper. If I am going to be in a crowded area or cities with a more serious pickpocketing problem this is my go to bag.
I love them both but for your peace of mind when on public transportation and biking and just enjoying yourself....I would go for the pochette. Oh, and get an Eva strap for it. That is how I use my favorite and pochette.

HTH!