To simplify, you can put it like this:
Advantages of Interactive Brokers over Corner Trader:
- no stamp duty of 0.15% per transaction value
- slightly lower transaction costs for both US and EU stock exchanges
Advantages of ETFs domiciled in USA over Ireland:
- can reclaim withholding tax on US domiciled stocks* (15% of dividend, ca. 0.3% of portfolio)
- lower TER
- higher selection
- lower bid-ask spreads
* applies to Swiss residents