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Well that depends on what you need your allies to do. I'm currently testing them with DE(who need AA and AT badly, so FBSC is a godsend).
Out of the three...I would say SW. They can provide Melta for AV14 and can hold their own in combat (TWC being a good example). Even Grey Hunters with CCW can dish out some pain.
Necrons would probably be next after them, no clear way for AV14 (aside footslogging Warscythes andmass Gauss) but they are very mobile with Nightscythes, Tomb Blades and others so are great for Gunline in terms of objectives.
Tyranids provide Psychic abilities through Flyrants (you take nids for Flyrants). They also give you the ability to tarpit with cheap troops (but with Tau, you might be able to just shoot everything off the board). Again, AV14 is a problem and the only real way to deal with it is EGrubs and Carnifexes (and Warp Blast if you roll it).
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