No altcoin is currently scalable. Ethereum is probably the only project that has all the incredients to make it work: funds, a huge capable development team, a roadmap, plans how to scale it ( securely ) and support and backing from corporations and institutions.
Yeah, I already invested in ETH, because I think it is a promising altcoin as well, for various reasons:
-already the largest altcoin by far, at least measured by market cap. Great for the network effect.
-active development
-receives praise from the usually very sober mainstream press, like Bloomberg
-transparent transactions, like with Bitcoin. No anonymity features, which would make it another niche coin for criminals and others with something to hide.
-smart contracts is a genuine invention and may become high in demand
-fast and cheap transactions, at least for the time being.
I'm just not sure how ETH would handle BitCoin like traffic.
Gulden (NLG). The team is great. There are enough funds. Community is really big & keeps on growing. Real users. Roadmap looks promising etc etc.
I'm not investing in
national crypto currencies. That's like taking one step ahead and then two back. The future is global.
What specifically do you mean by scalability?
The ability of the crypto currency to handle a large number of transactions in a timely manner for low or non-existing transaction fees.
Litecoin
I'm not investing in a dead crypto currency either. AFAIK Litecoin is just a copy of BitCoin with some tweaked parameters.