_iCarly_ was broadcast on the Nickelodeon channel, which is widely available and targeted towards a younger audience, while _Drake & Josh_ aired on the Nickelodeon spinoff network, Nick at Nite, which has a more limited reach and is typically aimed towards an adult audience. This difference in target audience may have influenced their respective viewership numbers.
Both shows were critically acclaimed, with _iCarly_ receiving 11 nominations for Primetime Emmy Awards and _Drake & Josh_ earning two Kids Choice Awards wins and eight nominations. However, _iCarly_ ran for six seasons, while _Drake & Josh_ concluded after four.
Ultimately, it is difficult to determine which show was more popular overall, as their success likely varied based on factors such as target audience, broadcast reach, and personal preferences.