The old kits are a mixed bag. I got HMS Ark Royal for christmas (I had built it as a kid back in the 1970s and wanted to apply my current skills to it). It was still a good kit, though the detail is far below what is possible with modern tooling. The Halifax was more of a chore - a brilliant kit for its time but the tooling was on its last legs with lots of flash on the smaller components and transparencies polished to smoothness over the years removing all of the surface detail. Still came up well.
It is a matter of personal choice. I love the modern toolings as you can do so much with them but also do old kits when no alternative remains. I have done several of the old vehicle kits because I was building wargame forces and others when you need a particular subject and no modern version is available (in my case a 1960s tool Macchi C202 Folgore by an Italian company I had never heard of to go into a dogfight with my son's Desert Air Force Curtiss Tomahawk).
A lot of the older stuff is ideal if you appreciate a challenge and enjoy scratch building things like interiors. But I favour the modern stuff. But will still consider the Vintage kits.