From the rumour mill, personal experience and advice from friends, my opinion.
Land ROvers are fairly good workhorses but far too agricultural and have a poor reputation for reliability
Mitsubishi don't like the double cabs and several friends have had severe issues that Mitsubishi have done their utmost to avoid putting right. Customer service it would seem is very poor!
Although a friend has had 4 or 5 single cab L200's and swear by them.
Navara have had their own reliability issues, the way they avoided the major engine problems on the D22's would not give me much confidence. Then the D40 came along, which looks far too soft and had its own issues and rumours abounded!
Isuzu their seems to be mostly good opinion, but just doesn't appeal
Great Wall wouldn't touch one with a barge poll, build quality on everyone I've seen has been horrendous! I would not want to be in one in a major accident!
Toyota have a great reputation going back years, but have rested on their laurels for quite some time. The god awful 2200kg towing limit was upped to 2800kg, which is useful, but still a way off the class leaders.
Ford Rangers have seemed to be abit antiquated. Then the last model seemed to improve things, but lots of rumours of poor build quality and chassis issues when worked hard.
The newest Ranger looks a good motor but possibly a bit early to know. A friend hated his to start, he switched from a D40, but is now loving it, to the point he has just ordered a new top of the range Ranger!
In truth the Toyota Land Cruiser 70 Series would kick all their arses as a work truck, but LHD and the high price rules it out for most.
If its just a tow vehicle or car you need then the simple answer is, get a 100 or 200 series Land Cruiser, will tow all day long and last for years!