For investors, MGK offers higher potential earnings through a concentrated mega-cap growth tilt but comes with higher risk and volatility, whereas VOO provides broader diversification, lower cost, and a more stable performance with a favorable income tilt from dividends.

SPY delivers broader diversification across its 503 S&P 500 constituents, with roughly 35% in technology, 13% in financial services, and 11% in communication services, and its top holdings are similar to MGK but not as dominant.

VOO and QQQ represent two distinct large-cap U.S. ETF strategies: VOO tracks the broad S&P 500 for wide diversification, while QQQ tracks the NASDAQ-100 with a strong tech tilt.

Fund size underscores liquidity: SPY exceeds $700 billion in assets under management, while QQQ sits above $400 billion, highlighting their status as benchmark, highly tradable ETFs.

All three ETFs move largely with tech exposure, so their prices are correlated, though QQQ’s heavier tech tilt magnifies both gains and losses relative to SPY.

In summary, these are two massive, long-standing choices with different sector focuses, fees, and risk profiles, making them suitable for different investor priorities and risk tolerances.