I have a GEB-7 and an LS-2 for use with dirt pedals. My experience is that I tend to use the LS-2 more because in live setting the issue is rarely bass loss alone, it's more about bass punch and a concurrent clean signal provides that better than a boosted dirt noise. I also prefer the action of engaging a Boss in a gig, rather than a 3PDT, it's more idiot proof.
I also have modded pedals (DS-1, ODB-3, OD-3), the fun with these is mostly in the process of modding. The standard DS-1 mod I would still run through a LS2, however the diode lift is a completely different beast, it's an awesome sound (not a DS-1 sound) and so works well as a standalone pedal. Horses for courses etc.
Using a guitar pedal and LS-2 is great, but it is more about adding a distorted flavour to the higher frequencies of your tone, a modded pedal is more transformative to the overall tone, it depends on what you want.