Your list looks slightly wrong, or you have written it down wrong. You have DVD-W which is not a format.
Anyway the five formats are:
DVD -R (minus R)
DVD +R (plus R)
DVD -RW (minus RW)
DVD +RW (plus RW)
There is also a DVD RAM format which does have some advantages but has never caught on.
You can only re-record on a RW (plus or minus).
Once an R has been recorded you can add more till it is full, but not overwrite what is there.
You can finalize a +R or -R DVD and once that has been done nothing can be added to it.
I tend to use -R but others may have their favorite.