-/+R (write once) media is more stable over time, of course you can only write to it once. -/+RW (rewriteable) media is good for relatively short term storage (up to maybe a year with good media, beyond that and you’ll risk losing data with even good discs, even though they MAY last much longer if stored properly). RW media also ‘wears out’ after a number of burns, it will vary depending on the media, disc condition, etc.
Long story short, for burns such as movies and data that you plan on keeping long-term, use +R / -R media. +/-RW media is good for short term data backups, data transfers, etc. Without getting into a deep discussion into what’s ‘good’ and what’s ‘bad’ media, Verbatim is one of the safest bets in media if you are looking to buy locally, it’s generally very good media and is often for sale at great prices. There’s plenty of other options as well, but you would be best doing your own research in the media forums and bargain basement forums here.