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wy is it better to use area lights in an interior than point lights?,.. is it because it's quality?,.... they increase also render times.....

Hmm you can't realy compare point light to area. They give completely different light and shadows.

Point lights are not possible in the real world (even a small light bulb generates light over an area, not a single infinitely small point) and so point lights don't really give realistic results when you use them with Kray - at least that's my experience.

Point lights can be very good for special effects in Kray, though. I've used them for generating the slight glow from floor-mounted LEDs quite effectively. Medium-low intensity with very short falloff.