When comparing Crossover 27Q 27" S-IPS vs Dell P2815Q, the Slant community recommends Crossover 27Q 27" S-IPS for most people. In the question“What are the best 27+ inch monitors?” Crossover 27Q 27" S-IPS is ranked 1st while Dell P2815Q is ranked 7th. The most important reason people chose Crossover 27Q 27" S-IPS is:
Good image quality due to IPS (In-Plane Switching) LED backlit panel made by LG in Korea with 6ms response time and standard 1000:1 contrast ratio and 8-bit colors. This is the same LG IPS panel used in Apple displays, but sold at a fraction of what Apple charges.
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Pros
Pro Good image quality
Good image quality due to IPS (In-Plane Switching) LED backlit panel made by LG in Korea with 6ms response time and standard 1000:1 contrast ratio and 8-bit colors. This is the same LG IPS panel used in Apple displays, but sold at a fraction of what Apple charges.
Pro Good build quality
Most customers report that Crossover 27Q is of high quality.
Pro Virtually no light bleed
Compared to other monitors this is practically non-existent light bleed.
Pro Lightweight
Crossover 27Q weighs about 7kg. Because of this it is easier to find VESA mounts.
Pro Great value for money
With Crossover 27Q listed as $417 with image quality the same as Apple Cinema Displays this is a good choice of monitor.
Pro Can calibrate the monitor yourself
You can adjust the monitor to display colors and blacks accurately as needed.
Pro Almost 90° tilt
You can use it as a vertical monitor if you're OK with a 3-4 degree offset.
Pro 40° left & right swivel
You can turn the monitor to both sides about 40°.
Pro Solid stand
Stand is rectangular, made of metal encased in plastic and of good build quality.
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 Unsupported
Con No input scaling
Make sure your graphics card can handle resolution of 2650x1440.
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.