I'm also new to this, and I'm facing a similar dilemma. I happened to have a +/- drive, so I can use both media. I've been looking for Japanese-made media, and so far only found Maxell and Fuji DVD-R. I can't find any DVD+R media made in Japan!
I've read the technical document on this site regarding +/- , and it seems that DVD+R is a better standard. But does it really matter which media I use, if they produce the same result?
To put it another way, should I go ahead and buy Japanese-made DVD-R's, or am I missing out on something by not using DVD+R instead?