Straddles and strangles are both pure volatility trades. The idea is simple: The more the stock moves, the better the position can work. The difference comes down to cost, risk and how much movement you actually need.
A straddle uses the same strike for the call and put, which keeps the trade centered and neutral but makes it more expensive. A strangle uses out-of-the-money strikes, lowering the upfront cost but requiring a bigger move to work. Sometimes the decision is practical too, since not every stock has a strike exactly at the money. No matter which structure you use, volatility matters. These trades tend to make more sense when implied volatility is low relative to recent movement, not when options are already expensive.
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