are we talking in a defensive or offensive fighting force?

I have to say that the german AF is not really comparable to perhaps the French and British. Italy doesnt compare here. As for the army I do not know, it's hard to tell when each army consists of many different types of each sort of weapon and all bound as a fighting force together in different ways. Offensivly i think the UK is best. They have more mobility. They could fight a faster moving war. The more pace you build up the more difficult it is to stop your advance.

The UK is said to have the best overall trained troops on the globe. This is just speculation, however they have proved themselves worthy of this title many a time. I believe this to thus be a possibility. This is just a general rule mind u.

Tanks, i belive the challenger2 to have better targeting, and fire control systems then the French or Germans. There armour is also better. However the C2 has proved in recent exercises that much work needs to be done to address it's reliability problems in harsh conditions. Other then these i believe it's over all capability to be better. It's affectivly a more leathal tank. The UK also has MLRS which is 10 times better then any artillery piece.

It's navy is probably better then all the others. Today for a navy to have good offensive capability they need carriers. The UK has STAL carriers with helo's and Harriers. The french are the only ones to come close with their large deck carrier holding Rafale. This brings them almost on par, however the UK has massive naval contingent of frigates, subs, destroyers etc etc.

When you look at the over all picture of things you have to go with the UK purely because in any war the air is where domination will lead to success. And the UK with it's E3s larger number of tankers and a fighter force with underestimated BVR capabilities will fair better.