"Old" Blockchains : Ethereum, Bitcoin were thought for "high use" ... but at time of conception "high use" was very low compared to the current demand these two well-known money are now facing ! That's why both of them are currently facing scaling issues (e.g. cryptokitties episode for Ethereum, Segwit2x or Lightning projects for Bitcoin). But these old mammoths appear to be difficult to change by consensus (see the Segwit2x failure:
https://cointelegraph.com/news/segwit2xs-failure-confirms-bitcoins-status-as-digital-gold)
RChain was thought with scaling in mind. Let me introduce you to 2 interesting RChain advantages :
1) It has the ability to perform simultaneous calculations thanks to an enhanced mobile processus calculus language : rho-lang (
http://rho.loria.fr/data/types2003.pdf).
2) Through an elegant use of namespaces, consensus needs to happen only in a given namespace (meaning everybody does not need to review all transactions from the entire blockchain) it therefore narrows the size of consensus needed and therefore is much more scalable than other cryptocurrencies like Ethereum (especially relevant for smart contracts where only few entities are involved, which represents 90%+ of the smart contracts use cases). It allows for example the possibility for two companies A and B to run their smart-contracts without being stucked in the traffic of all other companies smart-contracts; but at the same time companies A and B are benefiting from the decentralization and transparency of the blockchain
Among other things, that's why I think RChain can resolve scaling issues other cryptocurrencies (including Ethereum) are facing !
