I have both except my speedy b is 25. I don't see any cracking on both my Lumi and speedy b empreinte and I have used them both a lot. I bought both of them last march 2013 and both still look brand new. If I have to choose though, I would choose the speedy b 25 or 30. Its so versatile and just beautiful. It's also one of the classic designs of LV. I love my Lumi but it can get so heavy at times. Good luck on choosing, either way, they're both beutiful pieces.