I have no fuckin idea but here's what chat-GPT 4 thinks:

Hi, thank you for your question. I’m happy to help you with some information and analysis on the two ETFs you mentioned: SPYG and VGT. 😊

SPYG and VGT are both exchange-traded funds (ETFs) that track different indices of the US stock market. SPYG follows the S&P 500 Growth Index, which consists of large-cap companies that exhibit growth characteristics, such as high earnings growth, high return on equity, and high price-to-book ratios. VGT follows the MSCI US Investable Market Information Technology 25/50 Index, which consists of companies in the information technology sector, such as software, hardware, internet, and semiconductor industries.

Both SPYG and VGT have low expense ratios of 0.04%, which means they are very cost-efficient to invest in. They also pay dividends, although SPYG has a slightly higher dividend yield of 1.05% compared to VGT’s 0.70%. However, VGT has significantly outperformed SPYG in terms of returns over the past year, 3 years, 5 years, and 10 years. For example, VGT has a 5-year annualized return of 20.03%, while SPYG has a 5-year annualized return of 12.26%. You can see a detailed comparison of their performance, costs, holdings, and ratings on this website.

The main difference between SPYG and VGT is their exposure to different sectors of the economy. SPYG is more diversified across various industries, such as health care, consumer discretionary, communication services, and energy. VGT is more concentrated in the technology sector, which accounts for over 90% of its portfolio. This means that VGT is more sensitive to the performance and trends of the tech industry, while SPYG is more resilient to sector-specific shocks and fluctuations.

For a retirement portfolio with a 15-20 year timeline, you may want to consider your risk tolerance, investment goals, and diversification needs. If you are looking for higher growth potential and are comfortable with higher volatility and sector concentration, then VGT may be a better choice for you. If you are looking for lower risk and more balanced exposure to different sectors of the economy, then SPYG may be a better choice for you. You may also want to combine both ETFs in your portfolio to achieve a mix of growth and diversification.

I hope this information helps you make an informed decision about your retirement planning. Please note that this is not investment advice and you should do your own research before investing in any securities. I wish you all the best for your future! 😊