The traditional coop was always firmly fixed in the ground and could not be move around. In some ways that’s OK, but there are some very positive reasons for building or buying a portable one. The portable versions are easy to move and offer a variety of benefits.
Portable chicken coops are usually smaller in size than their fixed counterparts, but if you do not need a larger number of hens in your backyard then you should definitely go with the portable. Do not cram too many birds into a small of space. Just make sure that each chicken has at least 3-4 ft of space to move around. Otherwise you may endanger your hens’ health, and as a result also the egg production. On the other hand, if your coop turns out to be too big, though there isn’t really a “too” big, you can always add another hen.