i7-9700k vs i9-9900k

Im currently running an i7-8700k. I am considering upgrading to the i7-9700k since it is only 1-5 fps "worse" than the i9-9900k for $154 less. however it would still cost me $360 just to upgrade one generation. If you think i should upgrade should i just get the i7-9700k, or just go ahead and...