I don't know about any of these except the HQ Sweet 16 which I have. I LOVE, LOVE, LOVE IT! Also the HandiQuilter website has all kind of training videos (free and accessible 24/7). I pick up something new every single time I take the time to view one. For instance, this a.m. they had one on thread types, needles for long arms, bobbin control and tensions overall. It ran a little less than an hour and I picked up at least three things more that I had likely missed in previous videos. I got mine with the stitch regulator which I only use for the most intricate designs because FMQ is just so easy. I also got a lot of the quilting rulers available on the HQ site (pricey) as well as the Westaleer brand (very nice - also site tutorials).
Invest the time in continuing your own training. You won't regret it and most of it is free.