Depends upon what you are printing.
The 7130 is better for office documents as it prints and copies quite a bit faster in practice although the listed speeds in the specs make it look like they are about even. Try them in the store head to head and you'll see the difference. Also the 7130 uses bigger capacity cartirdges, so printing is cheaper per page than the 6110. It also has a duplexer included, although it slows down your print job a lot as it pauses a second before it pulls the page back in to print on the back. It also has the option to add a internal print server, if you want to have it plugged directly inot your network and not be dependent upon having its host machine power up and logged in.
The 6110 is a bit better choice if you're not doing heavy printing and want to do some photos, since it supports using the HP 59 photo cartridge that enables 6-color printing on the 6110, which gies you a lot better results on glossy paper than the 7130's 4-color printing (without the light cyan and light magenta, light blue and pink tones look a bit grainy because the pigment dots have to be placed really far apart before the dark pigments in the cartridge start to resemble the kinds of colors you see in blue skies or pink flowers). The odd part is that between the two, the 6110 is the one that DOESN'T have the digital media card slots, even though it has the better photo printing capabilities.