At the office: 27" non-retina iMac. At home: Dell Ultrasharp Ultrawide 29"(21:9 aspect ratio)
To be honest, sometimes it is a bit weird to switch between them. I love the horizontal space on the ultrawide, I can easily fit two apps/artboards/whatever next to each other and after that iMac feels like a square. But sometimes I feel like iMacs vertical space gives me more freedom, so I cant say that 29" ultrawide is the best option. Large 16:10 probably is the safest bet.
At the office: 27" non-retina iMac. At home: Dell Ultrasharp Ultrawide 29"(21:9 aspect ratio)
To be honest, sometimes it is a bit weird to switch between them. I love the horizontal space on the ultrawide, I can easily fit two apps/artboards/whatever next to each other and after that iMac feels like a square. But sometimes I feel like iMacs vertical space gives me more freedom, so I cant say that 29" ultrawide is the best option. Large 16:10 probably is the safest bet.