You will not get any advantage by going to FTEJerez. Instead, make you a favour and go to PAT Bournemouth or something like it. You will be treated as a real costumer and pilot, not just another number. Moreover, FTE is lacking of instructors and mostly of them are not carreer FIs, all the opposite in PAT or Exeter.
And for the JOC or FI, for the price of the JOC in Jerez you can nearly do both:
MCC+JOC at CRM Aviation / FI at Booker Aviation (Wycombe Air Center).
Good luck whatever you decide to do.