Changes the default rating form so that it's set based on post type. This overrides the general settings but keeps rating form chosen from post meta if set.

default_rating_form_by_post_type.php

<?php
/**
 * Sets default rating form for a post based on post type
 *
 * @param int $rating_form_id
 * @param int $post_id
 * @param array $params
 * @return $rating_form_id
 */
function mrp_default_rating_form_by_post_type( $rating_form_id, $post_id, $params ) {

	if ( $post_id ) {

		$post_type = get_post_type( $post_id );

		switch ( $post_type ) {
			
			case 'post' :
				$rating_form_id = 1;
				break;
			
			case 'page' :
				$rating_form_id = 2;
				break;
		}
	}

	return $rating_form_id;
}
add_filter( 'mrp_default_rating_form', 'mrp_default_rating_form_by_post_type', 10, 3 );