New Dell XPS 13: how to choose between 8GB and 16GB RAM?

Hi,

Where I live the Dell XPS 13 (2019) is available with 8GB and 16GB RAM. How do I choose between those, like when does 16GB really give you a benifit? Anybody experienced this in practice?

For example, will you see benifit in Chrome which uses alot of memory? I usually have 30 tabs open (3 instances with each 10 tabs) so will 16GB memory make a difference there?

Also, for video editing of 1080p videos, so not 4K, will 16GB be much faster than 8GB? 

Anything else with which you will see the benifit of 16GB of RAM over just 8GB?

I also have the choice between i5 and i7. Are these equally good in real life or when will you see an advantage with i7 over i5?

Thanks in advance for all good feedback on this!