Quote from qqqoptions:
They are not equivalent. Debit spreads have better Risk/Reward Ratios over credit spreads.
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Quote from braincell:
Why not do both so you're neutral volatility? Takes a bit of guesswork out of symmetry (correlation to VIX).
Quote from atticus:
No they don't. The same-strike bull call and put spread define the box arbitrage. A 100/105 bull call spread at 4.00 debit reflects a 100/105 bull put spread at a 1.00 credit, +/- a few pennies (related to the microstructure and cost of carrying the $5 position).
Long the call spread at 4.00, long the put spread at 1.00 = zero arb.

Quote from qqqoptions:
They are not equivalent. Debit spreads have better Risk/Reward Ratios over credit spreads.
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