We have our rabbits outdoors because my son and I have allergies to animal dander. When I decided to get rabbits, I thought it would be a good solution to us not being able to have pets due to our allergies and I thought keeping rabbits outside was totally normal. Since I got my rabbits, I have been learning a lot about how to take care of them and found that keeping rabbits outside isn't really the most recommended thing. At this point, I just try to take good care of them and provide them with whatever I can to help them deal with the weather. If you have the choice, indoors is probably less stressful for the rabbit and gives you more opportunities to spend time with it, but also, like Woahlookitsme said, both can be a good set up too: a cage and free range time indoors and a safe outdoor run for a nice change of pace on days when the weather is good.