While both Bitcoin and Ethereum are powered by the principle of distributed ledgers and cryptography, Other differences include block time (Ethereum transaction is confirmed in seconds compared to minutes for Bitcoin) and their basic builds (Ethereum uses ethash while Bitcoin uses a secure hash algorithm, SHA-256), In my personal opinion. a privacy coin is the best for the future you can review VEIL coin was the first PoS coin that implemented a fully private and anonymous way to send coins. Like Dash, you can spend Veil public or private.