140mm radiator vs 280mm radiator?

Kishan25

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Apr 13, 2015
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My case has air coming in from the front and leaving from the top and back. I want to install a cpu water cooler but idk if i should buy a 280mm radiator and place it on the top or buy a 140mm radiator and place it in the back. I feel like a radiator blocks some of the air from leaving thats why I feel like i should get the 140mm radiator so more air can leave from the top. But i also feel like the bigger radiator has more cooling power.

Case-https://www.nzxt.com/product/detail/154-n450-noctis-gaming-mid-tower.html
Prossesor-intel i7 6700k