Impresario wrote:
"Important factors are sand casted plates (rather than vacuum processed), white spruce soundboards (rather than Sitka), hard woods in the rim, and hand-notched bridges and stringing. There are many variables, but the better instruments contain high quality felts and genuine leather, superior woods and solid brass hardware."
Instead of of focusing on material X versus material Y and manufacturing process X versus manufacturing process Y, I'd rather focus on how well the piano actually performs in the end.
White spruce better than Sitka spruce in soundboard? Tell that to NY Steinway who has been making legendary concert instruments with Sitka soundboards. Change that to white spruce and you might just kill the "Steinway sound."
Hardwood definitely better than softwood? Tell that to Bösendorfer that uses spruce (softwood) in their rims. Change that to hardwood and you might just kill off the Bösendorfer charm.
Even within the same type of spruce, wood being wood, no all white spruce is equally well-suited for soundboard application and not all sitka is equally well-suited for soundboard application. Even if the same grade of spruce is used, two manufacturers may season the wood differently and arrive at very different results, or they will crown the soundboard assembly differently and arrive at different results, or they may match the soundboard with different bridge material and arrive at different results... the list goes on. Saying "this spruce is better than that spruce" is oversimplifying.
Different material, different designs, and different processes come together to make a piano that reacts in a certain way when played. Focusing on component-by-component comparison is, in my opinion, neither productive nor effective for the pianist/consumer.
Just sit down at the piano and play -- if it plays well, it is good, all the design elements, material, and processes work well together, great. If it doesn't play well, who cares if it has white spruce soundboard or hardwood rim or sand cast plate or solid brass hardware? The piano sucks anyway.