100-400mm 5.6 for flexibility
400mm 5.6 for ulitmate sharpness in a lightweight lens
Both lenses have a pretty big following for reasons above
RE; bigger glass....there's no real substitute for a nice bright 2.8 aperture, but try hand holding and panning with one before buying. Some get on with them....some don't. No sensible person really 'wants' to handhold a 2.8, but the results justify them (particularly in lower light)
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primarily using Nikon film and digi kit, and some micro 4/3rds gear for experimenting with old lenses
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