Are there Pros and Cons to trading SPX options instead of SPY?

The two biggest advantages I can see that SPX options have over SPY options is that 1) it's cash-settled at expiration and you never take physical delivery that could result in bigger losses and 2) it's a Europen option so there is no risk of early assignment against you. This is especially important if you do box spreads where you buy a bull call spread and a bear put spread at the same time otherwise this could happen to you: https://www.democraticunderground.com/100211709711
 
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