Here is a mundane but important question: what is the best single fund to track the whole market? There is now a wealth of options, from Fidelity’s free index tracker all the way to popular, but more costly SPY. The answer to this question is not as straightforward as one might think, as each of the funds has its own characteristics. For instance, while Vanguard’s VTI is popular, it has a quirky structure that can boost unrealized gains. It is also harder to trade without fees. Fidelity’s zero fee index mutual fund is a good choice, but only available on its own platform. Blackrock’s ITOT might be the best choice overall when considering fees, performance, and availability.
FINSUM: For being considered “vanilla”, there certainly are a lot of different flavors of index tracker these days.