Roughly 90% of our work deals with sequential numbering or individual fields of data being merged into an image file. We use both Gerber Omega and SignLab.
SignLab's "badge" function is hands-down the absolute very best...no questions about it.
I layout my template, and then with a few clicks of the mouse I can layout hundreds...or even thousands...of individualized images in just a few seconds. If you suspect that you'll be spending any significant amount of time your project, you'd be better off getting SignLab just for that feature alone.
JB