I only purchase the ones that bundle both the Blu-Ray and 4K UHD discs together. They end up costing more (as I import Region A than purchasing Region B) since Region A copies by default have the subtitle language (i.e. Japanese, Traditional Chinese) I want while Region B does not have it included since they often focus too much on European languages (i.e. Spanish, French or German). Do you consider 4K UHD better than Blu-Ray?