I have a TP-Link Archer C7 v2 that is starting to show its age a bit and I am hoping to replace it with a newer TP-Link router. I have been looking at 2 models the Archer C90 and the Archer A9. However, I am not sure that I see any difference between them. My specific curiosity is about the processor and if there is a difference there? I haven't been able to find much of anything comparing these two so any information is greatly appreciated.