Cloning/Copying DVD-RW/DVD+RW to DVD-R

I usually copy a video onto a -+RW, test it, then want to copy to a DVD-R or DVD+R for storage.

Can I clone/copy a DVD+RW to lets say a DVD-R without problems?

Or do I have to stay with - and + from the RW to the R?

Are there any good free copy/Clone programs to do this?

The disk (+/-) makes little difference, use Imgburn, its free.