We don't mind ZWB.U; it offers exposure to utiities and enhanced income through covered call options. But we cannot compare it to a money market or tiered investment savings account. ZWB carries equity/market risk, DYN does not. SHV is a short term US treasury ETF offering a 5.25% indicated yield (it will vary) and low volatility. Fees are 0.15%. ISTB is another option, with a big more variability as it has a 1-5 year laddered bond approach. Indicated yield 3.82% and fees of 0.06%. The latter could do better if interest rates do start to decline.
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