Hi! So, I have both the speedy 25b in DA, and the Alma BB in Epi. I love both, but they also serve different purposes for me. I use the Alma BB mostly when I don't need to carry much. It is a very easy bag that goes from day to night and looks very elegant. Mine is the Navy. It can fit my iphone 13 pro, small wallet, lippies, car keys, sunglasses in a soft pouch. The strap is the matching color leather strap, not the guitar strap. It isn't the most comfortable crossbody strap, but it's ok. I'm rather busty so it sometimes hits me wrong! I don't really play tetris with it, because most of my items kind of stand up next to each other inside, and because of the wide zip, it's easy to get things in and out. Though if I put sunglasses inside, they have to sit on top.
Now the Speedy 25B, I have in monogram and DA. I love it as a casual throw and go! I can fit the above things, plus ample room for a small water bottle, even a shawl or scarf. My ipad mini also fits. I do live a casual lifestyle 80% of the time, so they get alot of use. I will say though, that things bounce around inside because I don't carry that much everyday. So my iphone is kind of loose in there and shfts around which I don't love. So, I have remedied that with putting it inside another Maui Jim soft case. That way the glass doesn't get scratched.
However, if it's raining or rainy season, I use my Alma BB more so the vachetta on the speedys don't get stains.
Anyway, my 2 cents. I guess it depends on how you would use your bag, and how much you need to carry with you! I hope I have helped a little, haha!
Can you go in store and see them in person before deciding? That may be best if you can.