Just fancied some Burgundy and have had the Raveneau for a while now and you're never sure about a white Burg that is more than a few years old so had to open it sometime. I would say that both the reds were in a drinking window, but also had years ahead of them. With red Burg its usually only disappointing if you have caught them in a closed down phase (unless it just basically a poorly made wine). 2015 is more 'giving' with a lot more fruit but I've only opened 3 or 4 wines from that vintage. E.g. Prunier's A-D 1er Cru Clos du Val from 2015 needs more time. In general 2013 is not as highly rated as 2015 but producer should usually be the first place to look rather than vintage (unless its a real stinker, which doesn't seem to happen these days). It will be interesting to see how the 2013's turn out in the longer term though.