There's no practical ballistic difference between the three. The Taylor can be made for a few hundred bucks on a Mauser 98, so will always be popular, however its a wildcat so no over-the-counter factory-loads. The Rigby exudes Brit nostalgia, though the cases can be expensive sometimes, and it definitely needs a magnum action. The Remington is 'US Made', which means something to some people, and is available as a cheaper factory-load than the Rigby.

All three are easy to reload, and all three will achieve 2400fps with a 400gr bullet at safe Mauser pressures with modern powders. The Rigby has the lowest pressure, the Remington is mid-range, and the Taylor is pushing it a bit with some powders but still safe. All three will stun buffalo with accurate bullet placement!

You choose!