Which action for triggering cron “wp”or “init”?

Neither.

register_activation_hook( __FILE__, 'trigger_me' );

function trigger_me() {

    if ( !wp_next_scheduled( 'my_plugin_cron' ) ) {
        wp_schedule_event(time(), 'hourly', 'my_plugin_cron');
    }

}

Why parse code on every request when you don’t need to?

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