When you put assets with a expected return preferentially into wroth accounts, that increases the risk of the portfolio on an after tax basis. You want at least one asset in each account to be found in at least one other of your accounts. Of course, it's not a free lunch. A expected return, higher risk because more of the after tax assets are actually in the riskier asset. Keep in mind the future growth of the various accounts as you place assets into your various accounts.