Spot on
"He made money by buying Apple but for the last 20years has lost money holding railroads and Coke compared to just buying SPY"
I didn't believe it but the numbers support your proposition
(all data from Morningstar)
Berkshire Hathaway Inc Class B BRK.B v SPDR® S&P 500 ETF Trust SPY
% Total Return
Years 15 10 5 3 1 YTD
BRK.B 10.99 9.96 14.48 15.74 17.70 11.71
SPY 10.01 14.54 15.81 17.79 11.84 -5.22
For the " investment horizons" 5+ years, SPY is superior, especially considering the inbuilt diversification and BRK's need for continuing to make great decisions.
I stand corrected
BTW S&P 500 is my only shareholding, it has served me well for 10+ years