To sift through ETFs in China like the CSI $300$ ETF and China A$-$Shares ETFs, consider:

$-**$Expense Ratios$**$: Opt for funds with lower management fees for better net returns.

$-**$Liquidity$**$: Choose ETFs with higher trading volumes for ease of entry and exit.

$-**$Diversification$**$: Look for funds with a broad mix of holdings to reduce risk.

$-**$Tracking Performance$**$: Ensure the ETF closely follows its benchmark index.

Write out your reasoning based on these points, detailing how each factor supports your investment decision. Use financial platforms for comparisons and current data.