out of these two benzyl radical is more stable because it is have resonance structure
but tertiary alkyl radical is not stable because it is not having resonance structures
conclution:- as the number of resonating structures increases always that compound is stable
if the compound which donot have resonance structures that compound is unstable
example :- out of primary alkyl radical ,secondary alkyl radical & tertiary alyl radical
tertiary alkyl radical is more stable than secondary alkyl radical than primary because of +IE as the no. of +IE groups increases
stability of that radical increases
in the case of teritary alkyl radical it is having 3 +IE groups ie why it is more stable comapare remaining one also
thank u