Like anything else, there are pros and cons to installing an irrigation system in your yard. The biggest advantage is quite obvious. Your garden and/or lawns are automatically watered on a regular schedule that you select. The largest disadvantage is the cost involved to install such a system. This summer the pros appear to outweigh the cons. If your lawn is as burnt as mine is you will know just what I mean.
I have a soaker system in my back gardens to keep them looking good, but my front lawn has to rely on rainfall which we have none of for weeks.
I have come across many irrigation systems in the gardens (and yards) I look after. Some have sprinkler heads, others have a copper piping drip system, others have a combination of both. Which is better? That depends on what you want to keep hydrated and how much you want to spend. The experts you contact to install the system will advise you better than I can.
All I can say is that I can certainly tell the lawns and gardens that do have the luxury of an irrigation systems of some sort.