Man, are you in luck!
I'm a designated examiner, and I've worked with two of the schools you mentioned, and a couple of others. In my experience, AFDTC has the better program.
Flighty Safety appears to be new to the dispatching world, and I was not terribly impressed with their program. I was somewhat surprised, as I also thought their reputation inferred a good product, but alas, I didn't see that in the end. In fairness, it's been a couple of years since I was at FS, and perhaps they've made some changes--I don't know. FS (at that time) was more expensive, and maybe still is, but I wasn't impressed with the bang-for-the-buck there.
As far as job placement, nobody, and I do mean NOBODY, can promise any school graduate a job. Most schools do get visits from some airlines that hire folks right out of school. Most airlines prefer to hire from within their own ranks as an upgrade path, and to get folks who know their own airline inside and out. All airlines are unique, even if they are flying the same equipment. There are a couple of schools out there who have reputations for being license factories, but I'm sure everyone could say that about any school to some degree.
Lots's more to tell ya, but I gotta run. Check out the website for the Airline Dispatchers Federation (ADF) at www.dispatcher.org and you can also email me at email@example.com
ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.