Forum:What is the diference between the Hunter x hunter volumes and the ones called tomes?

Hi i have been a fan of the seriers for a while now and wanted to start buying them in english as unfortunatly i don't speak japanese. I was searching around in amazon and found two diferent types of release, i was wondering what is the diference between the normal volumes and the ones called tomes? which should i buy?

Thanks in advance for the help.