hey man I am almost a dinosaur on this site been so long since I last posted but your questions caught my eye , I am currently in the telecom program at bcit and If you ask job wise telecom has the most jobs if you are willing to stay in the Vancouver area wireless is new field so the jobs are very limited. However if you are interested in moving to northern bc or alberta instrumentaion is the one with the most money. In order to complete any of these diplomas you do need to complete the electronics common core first then you do these second year specialized courses. hope this helps to make up your mind