Many metal deposit (12 or 13, usually) and one more ECollector. Knowledge is gatherable without the need of capturing it. Downsides are one more hostile wormhole that can't be gateraided and eventually some core worlds (MkIV) adjacent. So for 150,000 energy and 240 or 360 m/s (I assume harvesters MkI or MkII; MkIII are less common), is it worth taking a more-than-average dangerous planet? The answer might be yes.
Personally, I often go for a quick succession of home assaults. However, I sometimes am in a position where capturing the first homeworld while preparing the second assault (Outa Tracks MkI, for instance). This also depends on which home you take first: the stronger or the weaker. I can't find the post where Red.Queen made an interesting comparison of both strategies. However, for the case we're interested in here, attacking the weaker homeworld first would make capturing it more desirable for using metal, energy and knowledge to improve the last big assault, while taking the AIP increase and the exogalactic wormhole.
Hope that helped.
