What is your opinion on synthetic etfs? As a rule, physical or optimized are always preferred.

I have transferred my portfolio from a robo to SC a few months ago and since then the

$SPEP (+0,03%) in the portfolio.

What would you do with this ETF? Just keep saving? Save for another physical/optimized S&P 500 and keep the position? Or sell the position and save for a physical/optimized one?

If I were to switch it would probably be to $CSPX, or do you guys have other recommendations?

Thanks in advance for your help.