Thanks for your inquiry.
The Honda EU series is considered the "Super Quiet" series and range from 1,000 watts to 7,000 watts. These units are totally enclosed and primarily used for recreational purposes.
The Honda EB series are considered "Industrial" and range from 3,000 watts to 10,000 watts. These units have Full GFCI protected outlets to meet OSHA standards on jobsites.
The Honda EM series are considered the "Deluxe" series and range in 4,000 watts to 6,500 watts. These units have electric start and are primarily used for home backup.