For reference, my video editing easily chews nearly through my Mac Pro's 48GB of RAM. If you bring the RAM to the table, the OS will use it. I'm using Chrome on my 2010 MacBook Pro with 8GB on El Capitan and it's taking up about 5. For the price I would (almost) never compromise on RAM that is not user-upgradable.
You're comparing a Mac Pro to a 13 inch Macbook Pro. That's apples to oranges. It also sounds like you do major video editing. OP probably will be fine with 8GB.
You're comparing a Mac Pro to a 13 inch Macbook Pro. That's apples to oranges. It also sounds like you do major video editing. OP probably will be fine with 8GB.