I've travelled in a lot of LRs and a lot of LCs as well as Mitsubishis and Nissans. In Africa in the 1970s and 1980s there were lots of LRs (80% of 4x4as), now they're 10% at best. There's a good reason for that.
In terms of Discoveries, the early ones had terrible brakes, and all of them are great if you want to spend your time maintaining them. Our Series 80 was far better than the equivalent LR, although we did have a few problems - blew the main radiator (as predicted a month earlier), replaced the A/C fan, and had to replace the front differential gears. This you have to expect from a 20 year old vehicle. The LC80 did a great job. I would not have considered a Discovery for one moment when we bought the Series 80.
So, of the two - a Series 80 LC.
Having said that, we now run a Montero - as good as the equivalent Land Cruiser, and half the price!