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This is partly an external tools question - and with Unity v3.4 Substances Bitmap2Material now has the advantage of having parameters changeable directly in Unity. But, I am wondering if one tool is able to produce results that the other is not - and which is best at generating true seamless (without distinct repeats that look odd - such as for bricks) textures?
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Bitmap2Material is quite a different thing to anything in FilterForge. It is more like CrazyBump on steroids (lots of them). FilterForge is more comparable to Substance Designer.
Seamless tiling is likely the same in both, since both in the end generate rectangular textures, but there is an art to producing seamless textures: you need to choose the right scale (eg. 2 bricks in your texture vs. 100), you need to avoid low-frequency distinct features (eg. top of texture overall darker than bottom, one brick that is significantly brighter than all the others), and sometimes you need to tile at a higher level (eg. have 4 grass textures that all tile with each other, and randomly use these on each 'tile' of your football field).
The best way to understand what is ultimately possible is to look at the galleries for all the tools. It's easy to get swept away by marketing hype otherwise.