I used to use Stihl chains exclusively, but with my sons becoming the age were they can use saws, it was getting expensive, I recently bought some Woodlands Pro from Bailey's and it is excellent chain for the money, I would rather have two loops of it rather that just one loop of Stihl for the same money. It holds a decent edge, sharpens well and performs, believe it is made by Carlton, there is many threads on this, just use the search function.
The John Deere saw I just bought (CS 56) came with a Oregon bar and chain, the saw is excellent, the bar and chain are junk. In my opinion the oregon doesn't hold an edge like it should and you have to sharpen it more frequently
than Woodlands or Stihl.