Don't get me wrong, a good friend of mine has a pair of Swarovski and they are excellent! The key difference is in low light conditions the Swarovski do out perform the Orions but for most of the birding I do the Orions do the job and do it well. I have been using the 10x50 for over 4 years now and they are great for birding from the car, a smaller pair would be more ideal for hiking or other on the move activities.
Not sure why they name those two models differently they are both Phase-Coated and waterproof - they are the exactly the same just different size. Also, looking around on Orions site I do not see the 10x50 available anymore (one pair left over at Amazon)? hopefully they have not discontinued those. There is the Savannah Porro 10x50 but I am not familiar with that model, it appears to be less expensive and might be great buy for the money?