Which was greater at their peak, Rare or Retro?

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Zippy6 said:

If we can't compare in terms of volume of output, line-up Vs line-up, then is this really just a Rares best game Vs Retro's best game?

Or "Did rare make a game better than Metroid Prime?". I don't really get it.

Rare in the 90s were by far better, I feel like this needed wording very differently if your intention is not to pit their full outputs at their peak against each other. Without special criteria to help them out Retro gets stomped.

Rare were absolutely better at their peak. If the question is who had the best single game out of their two respective libraries the answer may be different.

Basically, in terms of quality, rather than quantity, which was the more talented developer at their best.

The best of each would be one way to measure it, yes.