Discover the best ETF options for 2023 UK investors, comparing AJ Bell Youinvest Fundamentals IShares Core FTSE 100 UCITS ETF, BEST NASDAQ 100 ETFs, IOO Blackrock IShares Global 100, and Betashares Nasdaq 100 NDQ. Learn how these ETFs stack up against S&P500 ETF ASX IVV. Find the perfect ETF to fit your investment goals.