Yo siempre he dicho que el festival Inca Inti Raymi es mi favorito.
Explanation:
Here we have to put the verb <em>"decir"</em> (to say) in present perfect. In Spanish, the present perfect is used to talk about events that started in the past and continue or repeat in the present. It´s formed by using the verb "haber" in present indicative + verb in past participle. i.e.