You should create a poll.
I like scape #3 out of all of them. The wood and rock look very harmonized, with neither one stealing the spotlight from the other.
Scape #1 also has potential, but the rock pile looks odd and there's no main focal point to draw my eye to. I'm left wandering around searching for something to stare at. :hihi:
As for scape #2 and and #4, they aren't bad, but Iwagumis can get dull after a while. (For me anyways) Plus, why waste such good looking driftwoods?