I currently have a Mesh network with five X20's. One of the X20's is the Main, connected by Ethernet to Xfinity router. Need to extend network for better coverage so I bought three AX5000's from Costco. My question is how best to incorporate the new 5000's? Should I replace the X20 Main with an AX5000? If so doing, will there be any benefits in

speed, stability, channel selection, or 2.4 vs 5 choice? Any advantage of tossing the old X20's and replacing with all AX5000?

Thanks for any advice!