WINDOW UNIT OR PORTABLE AC?

Hello got a 5x10 tent ... 2k watt system is going to be in there. Should I purchase a window unit and build the box method or go with a portable since I have a little extra room in the tent being the tray is only 4x8. The portable would fit nice and be easier to install but a few people say the window unit is more efficient. What do you guys think? And why did you choose that option?

Which BTU should I get with 2k HPS in the tent...? I was thinking 12 or 14btu depending on window or portable?
 
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