I'd go with 40mm, if you're willing to shrink the dioramas to fit. 60mm are pretty rare, since they're impractical to place in anything but open ground (might as well just nominate a smaller terrain piece, at that point). 25mm or 40mm are a better bet, in terms of practicality/common usage - 40mm gives you the space for more impressive modeling without being too chunky and 25mm can fit just about anywhere. If you can only make the scenes work on 60mm bases, though, by all means go for it.
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