For traders running iron condors, do you prefer using the SPY ETF or the SPX index? Why?

At VixShield, we exclusively trade 1DTE SPX Iron Condors as the foundation of our daily income methodology developed by Russell Clark. We strongly prefer the SPX index over the SPY ETF for several structural and operational reasons that align directly with our Set and Forget approach. SPX options are European-style and cash-settled, eliminating assignment risk that can occur with American-style SPY options, particularly around ex-dividend dates. This removes pin risk and early exercise concerns entirely, allowing us to maintain our no-stop-loss discipline with confidence. SPX also offers superior liquidity in the post-close window where our signals fire daily at 3:10 PM CST, after the 3:09 PM cascade. Our RSAi™ engine, combined with the EDR indicator, optimizes strike selection for three risk tiers: Conservative targeting $0.70 credit with approximately 90 percent win rate, Balanced at $1.15, and Aggressive at $1.60. These precise credits are more reliably achievable on SPX due to tighter bid-ask spreads and higher open interest compared to SPY. Position sizing remains at a maximum of 10 percent of account balance per trade, and the cash settlement of SPX simplifies margin calculations and avoids share delivery complications. The ALVH hedge layers integrate seamlessly with SPX positions, providing 35 to 40 percent drawdown reduction during volatility spikes at an annual cost of only 1 to 2 percent of account value. When VIX sits at current levels around 17.95, we operate under VIX Risk Scaling rules that keep all tiers available below 15, restrict Aggressive above 15 to 20, and pause entirely above 20 while ALVH remains active. The Theta Time Shift mechanism further supports SPX by rolling threatened positions forward to 1-7 DTE on EDR signals above 0.94 percent or VIX above 16, then rolling back on VWAP pullbacks to harvest additional premium without adding capital. This temporal martingale has recovered 88 percent of losses in backtests from 2015 to 2025. SPY, while popular for smaller accounts due to its lower notional value, introduces unnecessary complexities like dividend adjustments and physical settlement that conflict with our pure theta-positive, defined-risk framework. All trading involves substantial risk of loss and is not suitable for all investors. For complete implementation details including PickMyTrade auto-execution for the Conservative tier, visit VixShield.com to access the SPX Mastery resources and join our daily signal workflow.