So I am looking to get an iMac for home use some video editing and casual gaming. Should I go with the latest iMac 10 core, 32gb Ram, 1tb storage, R5700XT and nano coat screen or with the basic spec of iMac Pro. Both are around 5.500 EUR price mark.
Upgrade the RAM yourself, you'll pay a fraction of what Apple charges.
One thing to keep in mind between the iMac and iMac Pro is that the cooling system on the Pro is vastly superior and will allow for longer sustained performance, but in short bursts the 2020 iMac will beat the Pro.
The 2020 iMac has a much better graphics card for games, it would last a lot longer than the iMac Pro. The Vega 56 in the iMac Pro is a good card but it’s 3 years old at this point and it’s going to be left behind in the next year with next gen games coming.
I’d get the 2020 iMac.
Also, you don’t need the 10 core processor for what you described. You don’t even need an 8 core really but you can’t get the better graphics on the 6 core models.