It's as you say, or so I believe. However, transdermal being the smoothest and releasing the slowest, even though levels are more stable, it still doesn't deliver as high a maximum dose in the blood as injections or even pills do, which is why people usually report faster results with injections and, to a lower extent, pills. But in theory, both of these should not be more effective, maybe even less, than transdermal in the long run, I think. Now, as for transdermal being actually better, I don't know. What's sure is that it's by far the safest, unless you get rashes because of the patch's adhesive, but that's another story.