Some ATCOs enjoy the challenges and complex traffic scenarios that Area provides, while others enjoy the opportunity to sit in the sunshine and take in the views, while actually getting to see real aeroplanes 'in the flesh' as it were.
Matter of personal preference really. I've done (& enjoyed) both disciplines in my time, but am perfectly happy now at an airfield (happily, with its own radar unit as well).
Other possible considerations might be - Area - nowhere else to go in the UK except Nats (+ although there are other choices abroad).
Aerodrome - some Nats units are 'stand alone' towers, so no opportunity to use radar, which removes some of the variety & interest from the job.
+ wider choice of units both inside and outside Nats.
Good Luck, whichever route you choose.
RC