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Two neodymium magnets together at each joint is usually standard. However, magnetic polarity may be an issue, when you want to interchange parts or limbs.

In that case you will want to use the very first unit you magnetize as the "polarity standard" for subsequent minis.
That is if you want to interchange limbs or attachments.

If you don't want to deal with polarity issues, you can use plain old scrap metal materials in the torso as attachment points, and use neo-magnets for the attachment limbs.
(or vice versa). This method is also more cost effective. But the limbs will not attach as strongly as it would between two magnets.
So you would need the strongest magnets that will physically fit the part using that method.