Seems to me there are at least 3 different threads running in this one:
1) Who provides the best air traffic service?
2) Which ATS provider is the best run & therefore most enjoyable to work for
3) Which ATS provider has the best pay and T&C
To which the standard reply will be:-
1) I am [ATCOs are not the most modest of people..
]
2)Any employer apart from the one I currently work for [Throw can have 3 goes at answering this one]
3)Hopefully the one to whom I am currently applying.
Ask 3 ATCOs for an opinion - get at least 4 answers.
I'll get me coat.