Which keyword gets more searches in Google "digital signage" or "digital out-of-home"? I asked this question myself about a week and a half ago and decided to use Google's keyword selector tool to find out. Lo and behold, the following results were spit out at me. 

It appears that "digital signage" beats "digital out-of-home" by a whopping 100%, given the fact that not enough searches are performed each month for "digital out of home" to even show up. The unpopular "Not enough data" reading is the only relevant information we are able to glean from Adwords. Other than the fact that advertisers competition for the phrase "digital signage" is fairly stiff, while it looks like not too many persons really are vying for the keywords: "digital out-of-home." 

Just some observations.