I have both and I really love both of them but my vote goes to reg damier. Azur is really pretty and I love using it during summer: it's so light and fresh. It really gets more compliments than the regular one. But the regular damier is more care free and it goes perfectly with almost everything in my wardrobe any season.
If it was summer I'd probably vote for Azur..
If the Azur will go better with your wardrobe it will be a better choice. You'll use it more. It's always annoying when you're getting dressed and realize you can't carry the bag you'd planned on because it's not a good look with your boots or jacket or whatever - you're always having to work around that.
I voted for ebene since it seems to be a more "all season" color combo, but that's just what I would choose. If you're leaning towards the azur I'd say go for it... you can't go wrong with either one, IMO. However, resale value is higher for the ebene if you ever want to sell it.