I have always liked having all my keys on one keyring. With just one key ring, it's hard to forget a key or grab the wrong set of keys. But there are times when I need to take just a car and house key with me in my pocket or evening bag or when I'm going out walking, I just need the house key not the entire bulky key ring. A while ago, I got tired of fussing with the big, bulky, tangled key chain and fighting with it when I needed to get a key off of it.
With each set of car keys coming off the central ring, it's easy to detach different combinations of keys; just one set of car keys, just the other set of car keys, just the house key, or a set of car keys and the house key.
This same configuration worked great when I had office keys on my key ring. The office keys were on their own ring attached to the central ring. That way it was easy to remove the office keys when I didn't need them on the weekend or on vacation. It was just as easy to carry just the office keys in my pocket at work and leave my personal keys with my purse.
This configuration is so easy and works great no matter how many keys you have. Give it a try and see what you think.