Monero (XMR) has my vote. It's similarly lower powered, has exceedingly low transaction fees (fractions of a penny, versus pounds for BTC), and also has the advantage of being fully private - unlike BTC. Every transaction in Monero is encrypted (sender, recipient, amount) and every real transaction accompanies 6 indistinguishable fake transactions to obfuscate the chain. You'll never be able to see who owns what, who paid whom, or how much, in Monero. The BTC ledger is public. What's the point of a 'crypto' currency that isn't fungible and doesn't have the privacy benefits of cash? There's a decent P2P/DEX market for XMR too which helps.