The camp cop-come-goucho look of CB Judges in earlier strips got replaced with gear closer to the MC1 look. Judges here are a social elite who make money by accepting cash to overlook crimes, though they can be quite ruthless and vicious. They tend to be immersed in crime cartels and can be subject to coups as other Judge/crime familes take over the position of Supreme Judge. a few years back the strip showed MC1 and East Meg 2 trying to install favourable regimes.
Generally armour is pretty similar for the world's judges, though they probably have less versatile handguns, Texas City Judges using revolver type weapons of humongous calibre.
Major difference to the standard 'Judge' are Hondo Judges, they seem to have personal fliers rather than bikes, anti-grav devices and suits or helmets with built in sensors. Added to this they tend to use lae shuriken profectors built into their gloves and side arms include electrified nunchuks and conventional wakizashi. I stated a Hondo judge up as an NPC in Go find the Lady in Signs and Portents.
The Brit cit Judge system was imported by the US Mega-cities to Brit-Cit, God knows why every nation followed suit. Still history shows nations aping the uniforms of the percieved military greats in the 19th Century and beyond..eg French Zouaves, Prussian helmets...so maybe late 21st Century saw a similar passion for fashion?