looking to buy an otc clay bar kit from walmart or target. meguiars has a kit that has 16 oz of q/d and 2 50 gram clay bars and a 16x24 towel for $19.99 on their site. mothers has a kit that has 2 80 gram of clay bars and 16 oz showtime and a 15x15 towel for 23.39 on their site. do you guys perfer one over the other? will buy otc. sure could use another m/f towel anyway. thanks