It depends what you intend to use it with, and as
@Fishrrman said, your preferences.
1080p&27” may be fine for you - but most “traditional” displays would be 1440p at 27”.
A Mac with a dedicated GPU you won’t have an issue if you want to scale it to other resolutions, or an integrated gpu (eg on a 2018 Mac mini) will be ok if you have at least 16GB of ram.