When you are searching for the most reliable portable generator you will probably have a few problems. This is not because there are no reliable generators, but because there are a lot of different units that fall into this category. To make things more complicated, everybody has their own opinion on which generator is most reliable.
There is a wide range of people that will tell you that Honda makes the most reliable portable generator. It is definitely true that Honda makes some of the best generators in the world, but again it is totally subjective when asking around to find the generator that is most reliable. You may talk to one person who has never had problems with their Honda, and then turn around to hear from another person who had to replace theirs after one year.
Yamaha is also at the top of the list when it comes to reliability. They have shown year in and year out that they can provide top notch generators to people from all over the world. They also have the benefit of their name. Yamaha is known world wide for offering some of the best products known to man, including generators.
When it comes down to what the most reliable portable generator is, the answer can sometimes be hard to find. Your best bet would be to try out what everybody else is using, and hope that it works out for you. If it does not, you can cross that make off your list, and move on to the next.