I posted parts of this under your other thread about experiences with your new bunny...
I have my first bun. It was (I am being specifically vague here) about 7 months old when I adopted it from a local rescue. I was looking for a colorful female, probably a lop as I had fallen in love with them, perhaps one with spots since I have had Dalmatians for over 20 years. I also knew though that I wanted a people oriented bun, and I needed one that could handle a lot of change in it's environment. I do some pet sitting in my home and also take in foster dogs. I needed a bun that could at times travel with me and/or be able to go and stay with friends if I needed to be out of town. In thinking through searching for a potential bun, I knew I needed to allow these specific needs and qualities to drive my search rather than focusing on the physical characterisitcs. In the long run it would do me no good to have a beautiful rabbit that was constantly stressed by it's environment. So, I started looking for a bunny that could meet my criteria and fit well in the environment I could provide for it. I did go to a rescue rather than a shelter as I was able to get more information about the individual rabbit's personalities and health than I would have gotten at the shelters near me that have rabbits. In the end I adopted a red eyed white male with upright ears which is about as far from what I set out to look for as I could get. But, everyday he proves to me that I made the right choice for my household. He had been in a foster home for several months, and had traveled with them on weekends and handled it well. He was also already neutered which was important to me.
My suggestion would be to figure out what would fit best into your household based on what you can offer it and then look for a bun that fits that environment. Look less at the physical traits. Many people will tell you that the personality of a baby bun can be completely different from what they end up like as adults. If you have specific environmental needs as I did, I would look for an older bun whose personality is already fully formed and find one that meets your needs and the needs that you can anticipate in your future (kids, additonal pets, travel, etc.) If you are OK with living with "whatever you end up with" in terms of personality after the rabbit has matured, a baby might be the answer. Also consider the additional costs of spay/neuter etc. in deciding if a baby or unaltered adult is something you are willing to pay for (price it out now!) or decide if you are OK with living with the hormonal side effects that might arise if you choose not to spay/neuter (and how will you handle them) and what it will take to live responsibly with an unaltered rabbit.