Also you can decide by looking at what the market is pricing in relative to what the probabilities are (in your mind) - one might be a more scalable trade where

Also you can decide by looking at what the market is pricing in relative to what the probabilities are (in your mind) - one might be a more scalable trade whereas it could be that the latter one was super cheap so you take a punt on it (e.g. let's say the implied volatility is far too low)