Swanwick (CTC?) - NATS in-house training. Likely an Area course leading to a job at either Swanwick or Prestwick, but some Airport courses as well. Could be either.
Gloucester - Contracted out Airport training with Global ATS. Definitely Airport (or maybe TC) but zero chance of Area.
If you definitely want Area, take Swanwick. If you definitely want Airports, take Gloucester.