The First Error Message Tells You Everything
My backtest didn't fail on some obscure edge case. It failed on line 3 — before I'd written any actual strategy logic. That moment, watching QuantConnect's web IDE throw a QCAlgorithm has no attribute 'SetCash' error (turns out it's self.set_cash() now, snake_case as of 2024), crystallized why comparing these platforms on "setup time" misses the point entirely.
Setup time is maybe 5 minutes of difference. API friction? That's hours of your life you won't get back.
I'd just helped a friend migrate his mean-reversion strategy from Backtrader to QuantConnect because he wanted their live trading integration. What should've been a weekend project turned into a week of hunting down method name changes, data access patterns, and order management differences. Here's what that debugging process revealed about both platforms — and which one I'd actually recommend to someone writing their first algo.
Why the "Hello World" Strategy Breaks Differently
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