Both modules differ a lot. The Top Boost has a lot of gain compared to the Blackface.
Top Boost has some jangle and chime, more/less depending how much gain is used. There is a low gain mod for it, but still it breaks up early. If you like clean tones with a little grit then the low gain mod could work, as well as the Super V module.
The Blackface is clean and fairly full sounding. Nothing really special about it other than it can be the clean channel on your amp, I recommend using slightly lower gain tubes for a crystal clear clean. Although, it will play nice with a TS type pedal to drive into a SRV-type gain/sustain.
Between the 2, I'd say Blackface w/ OD boost for Hendix or RHCP. But really I'd go for a JTM or Plexi/Brahma.