Print Preset RGB not CMYK

Thanks for all the replies after talking to a few print houses and the factory I work with in China seems like RGB is what to use if you are not printing on Off Set Printer. So the correct answer would be it all depends on how it's getting printed.

BUT.. This still doesnt answer my question as to why if you click the print tab when creating a new doc in Photoshop it changes to RGB and not CMYK like it does in Indesign and Illustrator. Why is Photoshop different when they are all created by Adobe. I could understand if it was a differnt design studio like Quark or Microsoft.

If you convert a RBG to CMYK you get a lot of color shift.

If you set Proof Setup to Working CMYK and turn on Proof Colors, you will get a preview of how out-of-gamut RGB colors will be brought into the Color Settings’ Working CMYK space. If you want to check the output numbers for a conversion to the working CMYK space, set the Info panel eyedroppers to CMYK—you can get both a CMYK preview and check output numbers without making the final conversion.

who would be using photoshop would be professional that would be sending thing to print

Even when you are creating documents for a CMYK offset press, the best practice is to work in an large gamut RGB editing space (with Proof Setup on and set to document CMYK), and then make the conversion to CMYK later in the workflow when the actual press profile is known. A color managed conversion to the final press profile can happen in Photoshop, but the same conversion can happen on an export to PDF from the page layout, or from the printer’s RIP.

There are a number of problems editing in a CMYK space. The black generation, gray component replacement, gray balance, and total ink amount required by specific press conditions are built into a CMYK profile—all of which could be ruined with color corrections after the conversion to CMYK. Also, layer adjustments and Blending modes don’t work well in CMYK—it can be easy to exceed total ink limits when blending colors.

Print means a lot of things. For most people it means inkjet printers, and printer profiles for inkjets are RGB profiles. They expect RGB data. Conversion to actual inks (usually more than 4) is done inside the printer driver.

CMYK is for commercial offset print, which relatively few people ever get in touch with.