Trade Republic vs. Scalable Capital vs. DEGIRO: Which Broker Is Best for Buy-and-Hold ETF Investors in 2026?

Choosing the right ETF portfolio model has never been more crucial—or more confusing—for European investors. With markets in flux and new regulatory changes in 2026, the debate between simple one-fund portfolios and more diversified three-fund strategies is front and center. As we covered in our complete 2026 guide to building a low-cost European ETF portfolio, portfolio structure plays a defining role in both returns and peace of mind. Today we break down the pros, cons, and practicalities of one-fund and three-fund ETF portfolio models—so you can decide which approach fits your goals. ## One-Fund ETF Portfolios: Ultra-Simple, Ultra-Low Maintenance The one-fund portfolio is all about simplicity. European investors often choose a single, globally diversified equity ETF—typically a UCITS-compliant product—to cover the world’s stock markets in one stroke. This approach minimizes decision fatigue, trading costs, and rebalancing chores. For example, a popular choice is a global all-cap equity ETF that tracks an index like MSCI ACWI or FTSE All World. With just one purchase, you gain exposure to thousands of companies across developed and emerging markets. Because these ETFs comply with UCITS rules, they’re accessible and tax-efficient for European residents. If you’re new to the concept, our UCITS ETF guide for European investors explains why these funds are so widely used. The main appeal? Set it, forget it, and let compounding do the heavy lifting. For investors who want minimal involvement, one-fund portfolios offer a stress-free path to global equity returns. ## Three-Fund ETF Portfolios: Control and Customization For those seeking more control, the three-fund ETF portfolio builds on the one-fund core by adding targeted allocations to bonds and sometimes real estate or a home-region equity ETF. The classic structure: one global equity ETF, one global bond ETF, and one regional or sector ETF. This setup lets you tailor your risk level by adjusting the stock/bond split, or tilt toward European stocks if desired. The three-fund approach is especially popular among investors who want to manage volatility, pursue income, or hedge against local currency swings. With more moving parts come more decisions: you’ll need to rebalance periodically and stay on top of market developments. But in return, you can fine-tune your exposure as your goals and risk tolerance evolve. ## How Do These Models Perform in 2026? Performance data for 2026 shows that both models have distinct advantages, depending on market conditions and investor preferences. One-fund portfolios have benefited from strong global equity performance, particularly as US and European markets rebounded. Their simplicity meant lower trading costs and no rebalancing drag. Meanwhile, three-fund portfolios provided downside protection when bond markets stabilized mid-year. Investors who included a European bond ETF saw less volatility during recent rate shifts, though their overall returns lagged pure equity portfolios during the rally. This trade-off between risk management and return potential is at the heart of the ongoing debate. If you’re deciding which broker to use for your ETF purchases, our 2026 ETF investing showdown compares Interactive Brokers, DEGIRO, and Trade Republic on fees and platform features. ## What to Consider When Choosing Your Model Your choice depends on more than just performance. Investors with long time horizons and high risk tolerance may gravitate toward the simplicity of one-fund portfolios. Those with shorter horizons, lower risk appetite, or specific income needs might prefer the flexibility of three-fund setups. It’s also worth noting that common mistakes—like home bias, overtrading, or neglecting rebalancing—can erode returns regardless of your chosen model. For practical tips, see our analysis of 5 common ETF portfolio mistakes European investors make. Finally, broker selection and automation matter. Platforms like Trade Republic and DEGIRO make it easy to set up monthly investments, which can supercharge the benefits of either model. If you want to automate your strategy, our step-by-step guide on automatic monthly investing with Trade Republic or DEGIRO is a helpful read. ## What to Watch Looking ahead, keep an eye on upcoming European Central Bank meetings and regulatory updates affecting UCITS ETFs. Market volatility and interest rate decisions could influence the relative appeal of bonds versus equities in multi-fund portfolios. As more brokers enhance their ETF offerings and automation tools, expect further innovation in how European investors build and manage portfolios. Whether you opt for the simplicity of a one-fund approach or the nuanced control of a three-fund setup, the key is aligning your model with your goals, risk profile, and investment horizon. For a broader perspective on constructing a resilient, low-cost ETF portfolio in 2026, revisit our complete European ETF portfolio guide.