If you're not familiar with the concept of implied volatility, you shouldn't be buying options, you're going to get killed.
Implied volatility for call option $5 above current price is about 31%.
Implied volatility for put option $5 below current price is over 46%.
Implied volatility is a component of every option pricing model... the more volatility, the more expensive to buy the option. You can also look at the delta value. The delta on the lower strike put is double that of the higher strike call (.14 vs .07), meaning you get a larger swing on a price move in that direction. Look at delta in very basic terms as the option move per dollar of price movement in the underlying.
But seriously... if you don't already get this stuff, you better be playing small.