[celticninja]

Most coins are now BTC imitators with some slight variation. ETH is tiring complete and is aimed at smart contracts, however the supply of ETH is relatively unlimited, unlike BTC which has a fixed amount.

Alt coins vary things like total number of coins or block rate and others look to improve aspects of BTC such as anonymity (Zcash and Monero) it's worth looking at the tech behind them to see whether you think it is worth investing in.

Many early coins such as PPC and NVC are essentially scams but something like NMC was trying to do something genuinely new, although the last I heard a serious security flaw existed in NMC which if it was widely understood should mean the death of the coin because it is no longer being developed as it is mainly a speculative vehicle it has stayed alive.

[cure]

I think you mean mean ETH is turing complete :) Awesome typo.