Well the 24" will have a higher PPI. If viewed from the same distance. The 24" 1440P will appear sharper.
Color quality would depend on the individual panels. There are some horrible looking 4K TVs and monitors. Good looking ones too. A 24" 1440P monitor with a good IPS panel will cost less than a 55" 4K TV with a good panel.
Well the 24" will have a higher PPI. If viewed from the same distance. The 24" 1440P will appear sharper.
Color quality would depend on the individual panels. There are some horrible looking 4K TVs and monitors. Good looking ones too. A 24" 1440P monitor with a good IPS panel will cost less than a 55" 4K TV with a good panel.