Yes they are faster, but my point with x64 (aka x86-64) is power consumption at idle/low loads is more than needed to do routing compared to ARM, save for the Intel J4125.
See that review, they recommend the N5105 but not the new higher CPUs because of power consumption. You can be using 5-10W with ARM, 10-15W with a J4125, but these higher chips are using 30W. Too much when my WRT32X stays under 10W and does Routing, Firewall, Samba at 100 MB/s, SQM cake at 500 Mb/s, Adblock, etc. ARM devices like that or the NanoPi R5S is plenty for OpenWrt.
For x64 boxes, Intel seems to be ignoring power consumption the last few years, these new 'low power' chips draw more, (all the way up to their 12th gen Alder Lake which draws 20% more power than the latest Ryzen 5800X or 5900X). For x64 the J4125 is still the way to go. A nice mini PC box with Intel J4125, 4x I225-V (2.5Gbe, kmod-igc driver), and USB3 ports at $300 is also a great buy no doubt.