I have a compact Adele and LOVE it! Yes the slots loosen with use a bit but its a good thing as they are much too tight initially. They do not however loosen to the point of cards falling out, at least not in my expereince. I only put one card in each slot so perhaps those that have experienced them falling out were putting more than one and then just putting one. Over stretching the leather. I say go Adele its a gorgeous wallet and the compact is perfect in my Pochette Metis!
I just got an Adele and LOVE it. The card slots are quite tight, so if they loosen a tad I won't be upset. I only use 1 card in each. I also like that it's big enough to use as a clutch, and if I take my galaxy s5 out of the case it will fit in one of the zippered sides.
If u have a lot of cards, go with Adele, if not, Emilie. I love the Emilie because I can put my S6 (with case) in there and use it as a clutch to run out for lunch. I tried doing that w/Adele and the fit was very tight.