choice of baler

Hi looking at buying a used baler they are both new holland 417 or 575 , the 417 is at dealer looks clean he tells me its 2007 but looks older from photos i have

The 575 is 2008 and the more mordern shape, my questions are is there much difference between balers and the bales they make .... only doing alfalfa and the 417 is 8k cheaper

side question how do the JD small square balers go on alf I see they use different feed system

thanks

choice of baler