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For me, the composition or number of shares, country distribution and average return also played a role in the decision.

For example, a FTSE All World (3,400 to 4,600 stocks from industrialized and emerging countries) covers more than an MSCI World (1,300 to 1,600 stocks from industrialized countries), and an MSCI ACWI IMI (8,000 to 9,000 stocks from large, mid and small caps) covers even more of the global world than the FTSE All World.

However, the broader the coverage of the world, the lower the return, because it is less concentrated on the world's economic leaders, to put it bluntly.

It is a matter of weighing up how much of the global market you want in a product and whether or not to add missing areas separately.
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@Metis good point 👍