Another fan of line arrays here. Line arrays have limited vertical dispersion (a plus for your room with low ceilings) and maintain double the loudness in dB the further away you are (a plus for big rooms). They tend to be expensive because you're using so many drivers, which pushes up parts cost.
All designs have strengths and weaknesses and need a good speaker designer who can navigate these carefully, but the strengths of line arrays IMO include superb dynamics, detail and clarity, and immersion in the soundfield. Other strengths will depend on the drivers used. My Selah Audio arrays use seas mid-woofs and Fountek ribbon tweeters. The Selahs are reasonably priced for the quality of drivers used.
All designs have strengths and weaknesses and need a good speaker designer who can navigate these carefully, but the strengths of line arrays IMO include superb dynamics, detail and clarity, and immersion in the soundfield. Other strengths will depend on the drivers used. My Selah Audio arrays use seas mid-woofs and Fountek ribbon tweeters. The Selahs are reasonably priced for the quality of drivers used.