Subaru 2.5 H4 & 3.0 H6 engines?

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How do these compare with each other? Economy? Reliability? Drivability?

Looking at Legacys which have the choice of both and the Forester which only has the 2.5 H4.

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Economy isn't the biggest of concerns really. I don't expect either to be great, but am curious on quite how bad they are? 15-20mpg? 25? Higher?

Seems to be a fair few mentions of the H6 having headgasket problems too? Is this issue limited to just the H6 from a certain era, or all of them? Is the H4 bad for HG failures too?

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Hopefully he will see this thread then. Found another thread which mentioned sub 20mpg for the 3.0? That would be a bit too low! On the plus side, it appears to only be early H6 engines which have HG issues.

A 2.5 WRX wagon appeals the most but I think it will need to be the legacy for space reasons.