but if I play games in 1080p using 2k monitor, the graphics may not look good, so I think better stick to native 1080p monitor.

When comparing the contrast ratios of the AOC 24G4 and the MSI PRO MP251 E2 monitors, the MSI PRO MP251 E2 offers a higher static contrast ratio of 1500:1, compared to the AOC 24G4's typical contrast ratio of 1000:1. This means the MSI monitor can display deeper blacks and brighter whites, providing more vivid images, which is beneficial for tasks like photo editing or watching movies.([Display Specifications][1])

However, the AOC 24G4 is designed with gaming in mind, featuring a higher refresh rate of 180Hz and a faster response time of 0.5ms (MPRT), compared to the MSI's 120Hz refresh rate and 1ms (MPRT) response time. This makes the AOC monitor more suitable for fast-paced gaming scenarios.([AOC][2])

Both monitors use IPS panels, offering wide viewing angles and good color reproduction. The MSI PRO MP251 E2 covers 99% of the sRGB color gamut, while the AOC 24G4 covers 126% of sRGB, indicating more vibrant colors.([MSI][3])

In summary, if your priority is higher contrast for better image depth, the MSI PRO MP251 E2 is the better choice. If you prioritize higher refresh rates and faster response times for gaming, the AOC 24G4 would be more suitable.([Display Specifications][1], [AOC][2])

I have been doing photo editing for more than 10 years, so I m sensitive to colour reproduction.