You realize neither plays with an All-Star right? Oladipo is better than anyone Harden plays with (and a great perimeter defender, like Beverly). Adams is better than Capela. Kanter is great at anchoring bench units and is a very effective post scorer.
The Rockets supporting cast might have more shooting, but overall they’re very similar in quality. The massive different in the playoff seeding and win column is Harden being better than Westbrook.