Trigger Finger Or Flat Boy? Options

[cinemafia]

I'm looking for something to use to add some flair to my percussion/drum loops, and I'm stuck between getting the M-Audio Trigger Finger or the KeyFax Flat Boy. They're both roughly the same price and can do mostly the same stuff. I guess the advantage that the Trigger Finger has is that it has real sliders whereas the Flat Boy has virtual ones that are accessed by the rotary dial. The advantage the Flat Boy is being able to function as a graphics pad (and I do graphic design as well).

Anyone use either/both of these that can give some advice?