Damn, what an amount of posts! It's strange this haven't surfaced before.
Someone noted, that it takes an extra click with the combo boxes to achieve the same thing as opposed to tabs. Apart from the current issue, this "extra click" also applies for other UI elements. I think all dialogs should be created by considering the number of clicks required to reach a certain option, and minimize this amount as much as possible. In general, I think it's a good GUI principle. I'm also referring to those "Are you sure?" dialogs, that cannot be disabled (for ex. at Linker libraries Delete option).
(BTW, Just a quick question: if the devs also preferred the old thing, who changed it then?
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Greets,
B.