Joe pad :
It's not about the 390x it's about a whole gaming pc.
Joe in a nutshell the 390x will be better overall.
Google eurogamer pc vs ps4
If memory serves correctly xbox1 gpu is equal to 7790 and i believe ps4 was 7870.
Visually the pc will generally have more details (see ie witcher 4 pc vs ps4 on youtube)
Also ps4 only has 8gigs ddr5
Where as your r9 390 has 8 gigs plus your mb ram.