I don’t know I would much rather see Plagueis and Sidious go up again Krayt and Talon.

Krayt and Talon vs Bane and Zannah would be cool! In the Legacy comics Bane's holocron gatekeeper thinks of Krayt as a "pretender" because he didn't follow the Rule of 2, it'd be awesome to see how the "old" Sith compete with the "new" Sith.

It's either vs. Revan/Malak or vs. Plagueis/Sidious for me.

I don't know much about Krayt/Talon and Vindican/Malgus and I don't think Bane and Zannah would have such a hard time against Maul/Savage or Dooku/Ventress.

Revan/Malak on the other hand... Bane was, from a certain point of view, somewhat Revan's apprentice at one point as well, wasn't he, seeing that he studied the teachings of Revan's holocron. Would be interesting to see if he could apply the lessons learnt against his "teacher". Although Revan also seems pretty powerful (possibly to the point of being overpowered), so, not sure how much of a chance Bane and Zannah would actually stand against him and Malak.

Plagueis and Sidious, on the other hand, are basically Bane and Zannah's "descendants" (Sith lineage) which would make an encounter very interesting. Though Bane and Zannah would probably have a hard time against these two Sith Lords

Bane and Zannah vs Krayt and Talon please! The rule of two vs the one sith is something I would really love to see!