IMO there are two significant issues the OP should keep in mind if he swaps his Champion 3100 inverter for a Honda EU3000iS.
1. Good news: The Honda EU3000iS is rated 49-50db at 25% load. The Champion 3100 is rated 57db at 25% load. That's a significant difference that's very noticeable if you've had the opportunity to operate these units side-by-side under the same load.
2. Bad news: The Champion 3100 inverter generator produces significantly more inrush current than a Honda EU3000iS. This means a Champion 3100 will successfully start and run significantly more 13.5-15.0k RV a/c units than the Honda EU3000iS. Even Honda advertises the EU3000iS as only capable of powering more "efficient" 13.5k RV a/c units.
The OP said he wants to power his RV a/c. Depending on his a/c unit's LRA, it may or may not be possible with the Honda EU3000iS---especially with the Eco mode on.
