By king and queen, I meant in terms of market value and most sought after coins.
bitcoin is by far number one because nothing else comes even close to it in sense of security, decentralization and utility.
from time to time some altcoin becomes too hyped up and gets a lot of pumps to reach the second rank in market capitalization specially if it has a gigantic supply. ETH is that altcoin. it is not "most sought after" at all. it is the most hyped. and it is pumped as long as the hype of token creation scam under different disguises (ICO, IEO, DEFI,...) is ongoing. otherwise it is centralized, insecure, mutable and useless with a huge inflation thanks to its unlimited supply.
Also, if arbitrage is difficult then what about algorithmic trading?
arbitrage is very risky since you can lose a lot of money in it, otherwise it is pretty easy to perform.
why are you looking for bots and algorithms, why not just trade normally?