Fidelity offers an expansive lineup of actively managed mutual funds and passive index funds, but the fund giant is growing its exchange traded funds business in rapid fashion. In fact, some of the best Fidelity ETFs are funds investors of all stripes will want to consider.Compared to rivals such as iShares, Vanguard and SPDR, Fidelity’s ETF roster is small at 29 total funds — 24 equity-based products and five fixed-income offerings. However, that diminutive status belies the broad opportunities available with some of the best Fidelity ETFs.Boston-based Fidelity also offers something for tactical and cost-conscious investors, as its lineup of 11 sector ETFs each carry annual fees of 0.084%, or just $8.40 on a $10,000 investment. That makes Fidelity sector ETFs the least expensive in