Long-Term Portfolio Advice: Choosing Between Index Funds (Developed, EM, Bonds) – Which Allocation is Best?

Hey everyone,

I'm building a long-term investment portfolio (10+ years horizon) and have narrowed my choices down to five funds. I'm aiming for a solid balance of growth and risk management using index trackers.
The Available Funds
Here are the five funds available and their key characteristics based on the latest available data (as of 30/09/2025):

1. iShares Developed World Index USD, Developed Market Equities
2. Vanguard ESG Dev. World All Cap Equity Index USD, Developed Market
3. iShares Emerging Markets Index USD, Emerging Market Equities
4. Vanguard Global Bond Index USD, Global Fixed Interest
5. L&G Diversified USD, Flexible/Multi-Asset

I initially ruled out the L&G Diversified fund for its high management charge (0.18%) and the Vanguard ESG fund because the non-ESG iShares alternative offered better performance/volatility and a lower fee (0.04% vs. 0.06%) over the 5-year period.
This leaves me with a core of iShares Developed World Index (low-cost growth), iShares Emerging Markets Index (strategic growth), and Vanguard Global Bond Index (stability).

My Proposal: 70% Equity / 30% Bonds

1. iShares Developed World Index USD 50%, Core exposure to the highest-performing, lowest-cost equity index fund available.
2. iShares Emerging Markets Index USD, 20%, Adds strategic diversification and exposure to volatile, but high-growth emerging economies.
3. Vanguard Global Bond Index USD, 30%, A significant allocation to the lowest-volatility asset for capital preservation and risk reduction.

Any advice on this indexing strategy would be greatly appreciated!