I also consider what type of job I'm facing myself with down the road when that customer comes in to have new graphics printed. I want the "easiest" removal I can get -- so much so that I follow up with customers for a rewrap when I see their vehicles around town and the laminate has started to haze/crack. If customers let it go to far, I'll just tell 'em I don't have the manpower and refer them to a (good) competitor (as a one-man shop, I have to be picky.)
For me, IJ180 and 1105 have been the easiest to remove (or at least somewhat predictable). I've used SLX on a handful of smaller jobs (no full wraps), but I'm expecting that film to be a bit more aggressive. Time will tell.
On a side note... I've performed adhesion tests with a variety of films, and after 30 minutes the SLX was significantly more aggressive than 180 or 1105. However, those tests were performed about 3 years ago, so things may have changed.