Choosing of brokers for cost savings: 10 years DCA into VOO vs CSPX, which is better?

Hi all,

I've been reading that Ireland-domicilied S&P ETF triumphs over US domiciled ETF.

I compared past 10 years of historical data of VOO vs CSPX assuming one DCAs 1 share every 1st of the month from Jun 2011 till May 2021.

My conclusion is CSPX wins after 01 Apr 2021 i.e ~10 years.

I assumed commission of 1 USD/share for VOO and 10 USD/month based on IBKR.

For VOO, we are actually paying less per month for higher liquidity.

Estate tax will be relevant if you invest in other US stocks with total amounting >60k USD

Please check in with my maths here. https://docs.google.com/spreadsheets/d/1CJntdKb...

Options at the 10th year:
1. one could switch over to IBKR and top up to 100k USD(no commission incurred).

2. Surely, in ten years, we would have more competitive rates for brokers with access to LSE? Switch to an alternate broker then.

Is this way of comparison sound?