I agree with the person above. Throwing in my two cents. For an everyday bag, you want versatility, practicality and capacity. I don't know what bags you have in your collection, but in my experience, you want a crossbody bag that can also be carried top handle. This should also be a bag you can carry casually as well as to fancy events where you dress up. The loewe puzzle bag and
fendi baguette are probably the most versatile bags. For the others:
I have both the Celine's Classic Box medium and Triomphe medium and I wouldn't recommend them as a heavy-use daily bag. If you have a lot of other medium/every day/daily use bags you can throw around and swap out, they are beautiful bags. I love their design, I love them as wearable art. But there are definitely bags that can hold a lot more for a similar size. Because of the way they're designed and the clasps, they don't actually hold a lot despite their size. This will depend on how much stuff you normally like to bring around. They can carry enough, but the leather doesn't stretch so there's no wiggle room on the off chance you do need to bring more stuff.
Another note is the smooth leather. I don't mind scratches or nicks, but some people do, so you might not feel as comfortable using them on a daily basis. My favorite everyday bags are actually my Polene Neuf. The price tag and the grained leather make it a very carefree bag.
I originally wanted a Dior Saddle bag too, and I watched a lot of reviews. The leather is durable but the capacity isn't great and the flap can get in the way when you want to get things out quickly. Plus, it's a very distinctive design so in a few years, you may not want to carry it around. But again, if you love the design and you are certain you will use it for ten, twenty years, and you love the design enough to accept its drawbacks, then you can consider it. However, the dior saddle bag is 4.2k brand new, and there are other everyday bags at cheaper price points that can also hold more stuff.