[generalizethis]

I'm not sure any blockchain scales "well," so it's like comparing turtle speeds. Likely they'll all be moving to lightening network for scalability, so it's a waste of time comparing them. The factors that are interesting for blockchains are immutability, fungibility and censorship resistance, and due to privacy, Monero wins 2/3. As for network security, that can change as more people appreciate how privacy influences cashlike properties--though I think Bitcoin will end up being a sort of digital gold going forward, which isn't a bad market to contral as far as price evaluation.