I know my response comes a bit late, but I have worked with both quite extensively in multiple applications.
The biggest difference is what gatesphere mentioned, the vertical resolution (how many bit's the ADC is) is much larger with the SD16. There are many applications where 10 bits is not enough (for example, an EEG). The other major differentiating factor is speed, the ADC10 is significantly faster than the SD16; if I remember correctly the SD16 in the F2013 has a maximum sample speed of about 4kHz. Remember that the Sigma Delta ADCs oversample the signal by multiple orders of magnitud