Best case in what sense?
Aesthetics? That's very subjective.
Ease of build? I'd guess the BitFenix Colossus since it's a full tower (so the interior will be more spacious) and looks like it has more space behind the motherboard for cable routing.
Airflow? I'd actually guess the Zalman Z11+, since it has more fan mounts, and they're closer to the components compared to a full tower.
Or something else?