SPX or SPY

What is better to use for spreads, SPX or SPY?
SPX has additional cost but no assignment risk.

Is there anything else to consider?
 
SPX has much lower cost and tighter bid/ask spreads, when you compare $50 spread on SPX vs 10x $5 spreads on SPY (at equivalent strikes).
On 10x SPY your commissions & spread/slippage could end up costing you 5-10 more than equivalent trade on SPX.
 
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