I have buff orpington chickens and various "wooly breeds" of rabbits. I like French Angoras best because not only do I get all the benefits of a meat rabbit (IF NEEDED.. right now, I rather eat dust <G>) but I can sell the wool too...
Housing.. chickens need just a small building for a coop.. I have an OLD nestbox with 8 holes that I use but you could use 5 gallon buckets turned on their sides or boxes, etc. They like to "roost" so keep that in mind. Feed is fairly easy depending on if you are "free ranging" or total containment or something in between. We free range but give grains etc if there isn't much out there.. laying pellets when needed only. The problem with free ranging is that the chickens lay eggs ANYWHERE.. so we periodically lock them up and feed the laying pellets, veg. peelings, etc to the laying hens until they have gotten used to laying in their nests again.. takes 2-4 weeks depending on how determined they are <G>. At least mine always go into the coop at night so it is easy to just keep them in there the following morning if there hasn't been any eggs found for a while.
Rabbit housing.. well, there are LOTS of ways to house a few rabbits.. wire cages being the best way since they are easier to keep clean, allow plenty of ventilation and can be various sizes. There are ways to stack them using "litter trays" and metal legs, or hanging them up (easier to raise worms under them of course). Bottom cages could be used for raising worms and the upper cages with litter trays will allow more rabbits per square foot of a building. Feeding pellets is a given. Some will protest here and say that you can raise rabbits on greens and grain.. and your "could", however the health of your breeding rabbits would be compromised in the long run (Unless you research and get a GOOD mix of grains and vitamins, salt, etc.). While some people claim that rabbits need alfalfa, if they are being fed pellets, then I would recommend grass hays.. for roughage and actually, price <G>.
Have you read the chicken and rabbit forums here? There are lots of hints and tips.. figure out where you want to house your "critters". Myself, I couldn't do without either very long, but chickens are MUCH easier to raise. Rabbits should be groomed or they will ingest the wool causing wool block (a potentially fatal condition since rabbits can not "vomit"), and their toenails clipped (or they can tear their nails on the cages.. causing pain and bleeding).
One other note.. some of the chickens have been inbred for so long they have lost their natural "broodiness" so if you want to reliably replace them, figure on either incubating the eggs yourself or buying replacements.. I was sooo lucky to find a hen sitting on her eggs and when we had to move her and the eggs, she successfully hatched out 13. (Down to 10 due to our cats). I don't think any of the other chickens have tried to sit very long. Rabbits can normally breed when you want them to. Except when the bucks have gone sterile due to heat and they may or may not "shoot blanks" for several weeks of temps over 80... younger bucks "bounce back" sooner.
I urge you to read the forums, ask as many questions as you can before investing in either one.... but I would also wonder why you could not have both???
HTH!
Terri