In a great many ways, though this is far from 100%, if properly used, the actual wood makes less difference than might be supposed. Although not directly related to solid basses, think of Bob Taylor, he of acoustics fame, who decided it was his skill, more than the wood, that made a good guitar. So he made a top-flight acoustic out an old oak pallet from his factory dumpster. The whole guitar is made from this! And it sounded awesome.
Like most of these things, it matters less than you'd think. Further confirmation comes from the likes of Bob Benedetto, doyen of archtop builders, who has stated that close-grained spruce is almost always given the nod for tops, when, in actual fact, the closeness of the grain is of no practical importance. And if he don't know, who does?