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BIAS Pedal allows you to tweak your until your hearts content all your distortion needs, allowing you to get some truly awesome distortion tones from light breakup to full blown ass whooping rrrrrrrrr.
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As CC said, BIAS Amp lets you build/tweak your amp very nicely, BIAS FX allows you to use the amps from and the you build in BIAS Amp, along with it's own good collection of Amps, plus of course has a comprehensive selection of effects pedals and racks. version of Pedal will be the price difference between both.
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I'd say get the lot, and the Pro versions of each, BIAS Pedal doesn't have a Pro version as yet, they have said it may be in the future and the upgrade from the 'Standard.
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