Not only will you gain great skills in a ED, you will learn when to truely be concerned about a patients condition. Instead of getting an adreniline rush during every call, which trust me is not a good thing. After a while in an ED you will be able to spot a truely sick patient from half a block away. If you can remain calm as the paramedic on scene, everyone else around you will be able to hopefully remain calm also.
Corky... your pros of working in the ED aren't just pros for the ED. You're saying a field provider can't see a sick patient from accross the room? You're saying a field provider can't learn / become / be calm under the pressure?
In fact, I'd argue, that a lone Paramedic (or EMT?) needs to be calmer, and better at recognizing sick patients, in the field than in the ED, as they don't have a higher provider to back them up or take control and make the decisions.
You will read (and look up medication names and uses hopefully) so often you will have a understanding of home meds most paramedics dont even have, unless they had the initiative to learn them on their own.
Uhh.. what? So, a pro of working in the ED as opposed to the truck is that you will look up medications "so often" that you'll get an understanding of them... that field medics won't... without looking them up themselves? Huh?
"Hey guys, guess what, you'll do something so much more than other people unless they do it alot too!" is essentially what you just said...
Sure, in general, you will see a 'wider variety' of patients in any given shift at a busy ED compared to a busy EMS system because that's where the patients are taken, HOWEVER, working in the field is invaluable, much more beneficial, as you are actually in the decision making and critical thinking aspect of patient care as opposed to "I'm going to splint your leg then take you to the bathroom'. Most EDs don't used Paramedics to their fullest potential as it is, so as an EMT, you'll do almost nil in that aspect aside from the nursing tasks the nurses don't want to do themselves.
Do one FT and the other per diem. Benefit from both.