Pick two plans and see how much you would have with each at 10, 20 and 30 years. Since both start from the same contribution, the difference is mostly the fee: an indexed robo-advisor (~0.4-0.7%) versus a traditional bank plan (~1.3-1.5%) can cost you tens of thousands of euros over the long run.
At 20 years, Indexa Más Rentabilidad Renta Variable PP ends up with €21,465 more, for the same contribution. The difference is mostly the compounded annual fee.
Indicative calculation: each plan is projected using its long-term reference return minus its total fee, over a constant monthly contribution, with no inflation or taxes. It is not a prediction; it shows the effect of fees. Past performance does not guarantee future returns.