When comparing Dell P2815Q vs Dell P4317Q, the Slant community recommends Dell P2815Q for most people. In the question“What are the best 27+ inch monitors?” Dell P2815Q is ranked 7th while Dell P4317Q is ranked 12th. The most important reason people chose Dell P2815Q is:
Vibrant, sharp & good overall color responsiveness with 1.073 billion colors and a 5ms response time.
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Pros
Pro Good image quality
Vibrant, sharp & good overall color responsiveness with 1.073 billion colors and a 5ms response time.
Pro Full swivel stand
You can turn it fully to a horizontal or vertical position.
Pro Good selection of connectors
Dell P2815Q has HDMI 1.4, Thunderbolt, 2 DisplayPorts (1 in, 1 out) and 4 USB 3.0 ports. HDMI 1.4 & Thunderbolt are capable of 4K @ 30Hz.
Pro VESA mount
So you can mount it to a desk stand or a wall.
Cons
Con Bad viewing angles
Since it's a TN monitor, it has worse viewing angles compared to IPS displays.
Con Bad refresh rate
At 3840 x 2160 it's max 30Hz and at 1920 x 1080 it's max 60Hz.