You will never get a truly objective answer to this question, there is a traditional conception that a Land Rover of any kind is always breaking down and always leaking oil and that a Toyota of any kind will never leak oil and will never break down. It is almost like a religious opinion. Like the idea that the Japanese vehicle is more 'Aussie'. I personally suspect that this is partly due to the fact that when Toyota started to gain market share, there were a lot of old Land Rovers around that had done a lot of hard work, also in that era pretty much all vehicles were somewhat unreliable. Toyota gained market share in the outback during a period when Land Rover were unable to supply enough vehicles to meet demand, otherwise LR would not have lost that market share. Now that the market is firmly in the Japanese hands, the fact that every vehicle in the outback is a Toyota is a self-perpetuating thing.
I owned several Toyota 4wds in my 20's before getting into a Range Rover. It was at a time in my life when all I could afford was old, worn-out vehicles. Thus I went from unreliable, maintenance-hungry Toyotas to unreliable, maintenance-hungry Land Rovers. I've walked out of the bush from a broken Land Rover and I've walked home from the side of the highway with a broken down Toyota.
My observation from assisting numerous people with breakdowns and problems on our Kimberley trips (and this is what my toolkit and spares inevitably end up being used for) is that it is the aftermarket add-ons that introduce unreliability into a late-model vehicle. The big manufacturers have the resources to undertake exhaustive reliability testing on their vehicles and they have recall campaigns when problems arise. The owners then get some spotty-faced kid at a suburban 4wd shop to install accessories from manufacturers who have no such resources.
I'd drive my Defender across the outback tomorrow, but I'd carry a decent toolkit, some basic spares and an HF radio. Same as I would in a Toyota.
