Benzyl chloride exhibits higher stability and reactivity due to the resonance stabilization of the cation formed during its reaction. Despite ethyl chloride having more alpha hydrogens, the resonance in benzyl chloride allows for a faster reaction rate. This increased stability of the benzyl cation contributes to its overall reactivity compared to ethyl chloride. The discussion highlights the importance of resonance in determining the reactivity of organic compounds. Understanding these factors is crucial for predicting reaction outcomes in organic chemistry.