Dunno, I have both installed on my computer.  But he asked if it would cause any problems
to remove DAZ Studio, and it wouldn't cause any problems with Poser if DAZ Studio were
removed.  Now I will admit I hardly ever use DAZ Studio, because I am more comfortable
with the Poser interface, but like you  I have a large hard drive and it's not hurting anything
to keep it.  So basically if one wants to keep it and space isn't a problem, keep it.
If you would rather have the space for something else and you are comfortable with
Poser and want to get rid of DAZ Studio, right click Delete it.