ETFs are generally more tax-efficient than mutual funds, potentially making them a better vehicle for delivering alpha in taxable accounts. Active ETFs combine the adaptability of active management with the tax advantages of ETFs, as only 16% of active ETFs have distributed capital gains in the past five years, compared to 53% of active mutual funds. 

The ability to defer capital gains through in-kind redemptions can significantly reduce tax costs, allowing for better compounding of returns over time. Tax efficiency plays a critical role, especially in strategies like active equities, where minimizing taxable distributions has a notable impact on performance. 

Evaluating active ETFs involves assessing the manager’s skill, the market’s alpha opportunities, and the investor's ability to select and stick with quality managers. Incorporating active ETFs into a portfolio requires careful consideration of the fund's exposure, risk profile, costs, and long-term performance.

Finsum: Thinking of tax as alpha is really the correct quantitative approach that gives a holistic view of your portfolio.