You’ll get better value with a I7 vs I9 as you will pay a premium for the I9. But make no mistake the I9 will be faster, how much, Depends on which I9 you go for as they go up to 18 cores. Now if the keep your machine you want to make sure you get a 10 gen as they have a few features like AI especially designed to work with content creation software and wifi 6. If you are looking at a laptop you’ll be able to get a laptop with Iris graphic, it very close to having a separate video card.
Personally I went with a gaming machine and Maxed the ram, and HD size and upgraded to pro. I’m just missing thunderbolt-3 on my machine as I purchased it before it was available. I figure it will be years before the machine will seem slow, especially considering I’m still getting good use from my 7 years old I7