Which format(s) have the most available free space to write to?

[dbminter]

Which has the most available free space, after formatting by ImgBurn, to write to?  DVD-RW or DVD+RW?  Even though the difference may be very minor.

 

 

Which has the the most available free space?  DVD-R or DVD+R?  Doesn't DVD-R have slightly more available space than DVD+R?

 

 

Thanks!