I currently have enough money to upgrade my ram or ssd so which one should i get?
Specs: i7 8700k,
8GB Ram ddr4 3000mhz,
120 gb ssd,
SSD unless you need more than 8gb of RAM for a specific reason.
You have 120gb SSD now? Get more ram unless you're running out of space in the ssd.
If you don't have any SSD currently, get the SSD.