I must agree with you SJM, JeriShow had perfect chemistry, and Chris made Big Show a credible wrestler once more, after having jobbed out to John Cena on numerous occasions.
Besides I think Big Show was more fitting around Chris Jericho, basically because first of all they had some fun moments, like the one "off camera" where Chris basically disses the Canadian crowd only to realize the camera is on, and their small arguments over who's the leader of the team, Big Shows otherwise neutral personality in that matter vs Chris Jericho's high temper that clearly showed that he wanted and considered himself to be the leader and backbone of the team.
The only thing The Miz and Big Show has managed to gather up in that manner is a funny episode of Big Show yelling at a mechanical cow, and their "argument" over the name of the team, which is basically a rip-off from JeriShow which was basically fan made rather than WWE made (at least I would consider it fan made, cause I haven't heard WWE refer to them as JeriShow untill a few weeks / months after it circulating the Internet as the general description of the two)
And to top it off, certainly The Miz is on a roll right now, and certainly getting elevated rather nicely, but considering Big Show is a more established upper mid-card / potential main event title holder, you would probably agree with me that Chris Jericho elevated Big Show, Big Show elevates The Miz.
So for the credibility and sake of making Big Show interesting, Chris jericho and the team JeriShow did the most for the Big Show, was the more entertaining one to watch (because you could get to watch these two on every freaking Smackdown AND RAW throughout their title-reign, as opposed to The Miz and Big Show who makes an occasional single hand or teamed appearance on Smackdown, hence JeriShow exposed Big Show more too) and therefore, I believe JeriShow did the most for, the Jericho described "massive destroyer(!!!!!) The Big Show".