Totally agree with the opinions - wow, we are unanimous! In addition to the differences in numbers, I think there is also a big difference in terms of the feeling. The Olvidado (particularly the mountain sections after Aguilar de Campóo) has a lot of sections that I think can be described as remote. Many kms from anywhere with nothing but the natural world enveloping you. GPS is essential, even though the marking is generally very good. The Invierno, though untraveled, is not in any way remote - almost always close to roads, towns, churches. The Invierno is probably the most over-marked camino you will encounter, and the Xunta continues to dump many euros into more marking!