i simply prefer tarps because i like being outside, that why i'm camping. i enjoy viewing an open fire next to it and how it warms me. i like instantly seeing what's going on around me. they dry out faster. they cover more ground area for the same weight/packing-volume. they're safer if a stove needs to be used under one. i find tents to confining and depressing, nor are they as easy to exit should one catch fire.

but tents can be the better option in treeless terrain, extreme wind conditions, or buggy areas...