Got bored again so I looked at going long NQ vs shorting SQQQ. I normalized the leverage of NQ based on drawdown.
total log returns trading normally NQ: 353% (40% drawdown)
total log returns shorting SQQQ: 365% (40% drawdown)
(these results are from an overly fitted backtest, not actual profits)
So shorting SQQQ is 3% more profitable per trade than trading futures.
HOWEVER, this does not include fees and more importantly, does not include the much more favorable 1256 tax treatment of futures. You will save at least 10% on taxes in the USA trading futures compared to equities.
Because the buy sell spread of future is much smaller?