I think decision depends a lot on what your primary purpose in using the bag will be.
I have owned both the Balenciaga hobo and the Balenciaga city. If you carry a lot of stuff, and if you accumulate things during the day, I would recommend either of these bags. The hobo is larger than the city and it is capable of holding much more than the city. I'm constantly amazed at how much I can fit in my hobo. The city also holds quite a bit. The main benefit of the hobo is that it is easy to throw over your shoulder. The city has a shoulder strap, but if you want a bag that you can easily wear on your shoulder, I would choose the hobo, hands down. In terms of comfort, out of all the bags you listed, I think it allows for the greatest ease of use.
I do not have a Chloe hobo, but I have tried one on in the Chloe boutique. I do have a Chloe paddy. Paddys are much heavier than the Balenciaga bags are. Both the hobo and the satchel can fit over the shoulder, but the hobo fits over it with more ease; it is meant to be worn over the shoulder, whereas the satchel can be worn either in the crook of the arm or on the shoulder. The hobo is bigger and holds more than the satchel. I think half of the appeal with the paddy is the lock. When being worn, it is very difficult to see the lock on the hobo. Instead of dangling in front of the bag, it kind of just lays across the middle of the bag. If you want to show off the lock, then go with the satchel. In general, I think it is a more visually appealing bag than the hobo is.
If you are looking for a bag that you will be able to use at night as well as in the day, then the Balenciaga first is the bag for you. This bag is the smallest of all the bags that you listed, so if you carry a lot of stuff with you during the day this might not be the wisest choice. You can fit your keys, a make-up pouch, your wallet, and an ipod in the first, but not much more than that. If you go out at night this is a bag that you would be able to use for that purpose. I don't think any of the other bags transition particularly well from day to night. The satchel and the city possibly, but definitely neither of the hobo styles.
Good luck with your decision.