Depends if you want to stay in the UK.
No doubt that the best, and highest paying salaries outside the UK are for area ATCOs, but you've got to take the long term view and decide what you want to be doing when you are 45 and unlikely to be able or want to move to another unit before retirement.
If you leave the UK, your previously validated CAA ratings expire after 5 years, thereafter you have to do it all over again.
Persue an area career with NATS and there's no doubt that you'll have a very well paid job for life, but very limited opportunity to move elsewhere - Swanwick or Prestwick in the UK, Eurocontrol or the Middle East and limted opportunities elswhere.
Take the tower option and you are stuck in the UK, you have the option of working at any NATS airport which will have you but to work at a non NATS unit you will need the APS (Approach Radar) rating.
At either Area or Airport you will start at the bottom of a big heap and be a very small fish in a big sea for a long time, but that doesn't matter because, although as a jobbing ATCO you might earn £5K less than a supervisor, you won't take the work home with you - which, although they may deny it - all supervisors do.
Whatever choice you make will be the right one for you, just don't be impressed or influenced by those with big egos and limited experience.
Good luck.