Which panels are best and why?
Depends what you want them to do. Best meaning what? Light weight? Efficiency? Appearance? Cost per kW?
Efficiency vs cost - so cost per kW I guess.
Thanks
Many of the big solar fitters (Solar Century spring to mind) use Yingli.
Bit of a far reaching question that. Bit like saying what bike is best a Trek or a Specialized - they both make lots of different bikes.
A lot depends on the specific panels that you are looking at when trying to calculate cost V output/efficiency. Also depends on how big a system you want, the size of the panels, and what you can get on a roof (assuming that's where you want them).
The solar panel/bike analogy is pretty good. There are lots of well known brands, lots of less known brands, and a fair amount of this Far East "unbranded" panel is made in the same factory as the [insert well known manufacturer here].
Our company (I don't work in our solar team so not an expert) provides Schuco and Kyocera polycrystalline panels.