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The Long Perng is likely the better scope using more expensive glass (giving a more color pure image) and it has a better focuser - since both scopes cost $3000 it's the one I'd consider first. Long Perng also seems to have better quality control standards.
I purchased one of the North Group ED127's that David refers to - not a bad scope but certainly not finished to the standard I'd expect of a LP or William Optics scope. The first objective came with a certificate indicating it was about 1/4 wave pv (which is ok) but was exchanged due to a long, shallow scrape in the coatings. The replacement objective wasn't accompanied with a certificate but is better figured with an excellent star test.
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