@Dom
The only real difference is trading hours.
From an EU perspective:
The EUR version is tradable in the morning and the afternoon
The US version is tradable in the afternoon and the evening
On shorter time scales you’ll have different trading opportunities
On longer time scales it doesn’t make any difference which one you trade.
I had a conversation about that with @Richard.W a couple of days ago.
FX doesn’t create a profit difference between those products.
If you buy USD you won’t see the EUR/USD fluctuation effects on your chart.
If you buy EUR the fluctuations will be automatically integrated to the price on your chart.
If you want to hold, you should buy in euro, especially if you’re supposed to join the eruozone at some point.
Once part of the eurozone, you won’t be able to trade american funds as per regulations that came into effect in 2018. Something related to a “key information document” missing for US ETFs…