iShares Edge MSCI World Minimum Volatility vs iShares Core MSCI World EUR Hedged

They track different indices: iShares Edge MSCI World Minimum Volatility follows MSCI World Minimum Volatility and iShares Core MSCI World EUR Hedged follows MSCI World (EUR hedged). They also differ in cost (0.30% vs 0.30% TER), replication (physical vs physical) and domicile (Ireland vs Ireland).

Nobody can know that: they track different indices, so their returns will diverge, and past index performance is not a prediction. What you can control today is the cost, the tax structure and whether the index actually covers what you want exposure to.

Their fees are effectively identical (0.30% vs 0.30%), so cost should not decide this one. Look at index coverage, distribution policy and availability at your broker instead.

iShares Edge MSCI World Minimum Volatility is accumulating (dividends are reinvested inside the fund) and iShares Core MSCI World EUR Hedged is distributing (dividends are paid out to you). For long-term compounding in Spain, accumulating usually defers taxation; distributing gives you income you are taxed on each year.

Yes. Unlike two funds tracking the identical index, these give you genuinely different exposure, so holding both is not automatically redundant — just be aware you may end up overlapping on the largest companies and doubling your rebalancing work.