What would you backtest first?

Hey! 👋 Kistack launches on Product Hunt June 24.

While we wait — I'm curious: if you could instantly backtest any strategy, what's the first thing you'd check?

SPY vs QQQ? Lump sum vs DCA? Dividend ETFs over 10 years?

Drop it below and I'll run a few of them and share the results (with screenshots) right here before launch. 📊