Which one causes more na and h2o reabsotbtion angiotensin ii or aldosterone?

Both can: Increase sodium and water retention, but generally aldosterone is more active, present in larger amounts, and maintained at higher levels. I would be curious about what led to your asking this question.

Aldosterone: Aldosterone is powerful in causing na reabsorption. Ang ii is a powerful vasoconstrictor. Ang ii is converted from ang i by angiotensin converting enzyme (ace).

Read on:: They are part of the same pathway. Angiotensin ii in the kidney leads to the release of aldosterone from the adrenal cortex. Angiotensin ii also causes sodium retention in the proximal tubule, but which is more potent? Good question. You'd have to do a rat experiment on isolated nephrons ex vivo. Maybe it's been done?

AII vs aldo and salt: Aldo causes more Na retention and water follows salt. But depends on circumstances. AII is major drive to aldo production so if AII high get same effect if you don't die form the severe HTN from excess AII. Both can be counteracted if you eat less salt. I am a specialist in the renin angiotensin aldosterone system and happy to consult with you.