mine is Ash.
I'm a big fan of Ash and love a trans finish on ash. That's bass royalty right there (IMO).
but can be heavy (and supposedly getting scarce).
basswood has its share of detractors on here (wood can be too soft, no grain, etc) but might be lighter weight, if weight is important. I've owned a bass or two made of basswood, such as a Bongo. no complaints from me.
Okoume is much like mahogany, IME, and G&L get's some beautiful pieces, shown off with fantastic trans finishes.
I've not played an okoume one. I've owned several mahogany basses, including a few G&Ls. Mahogany is probably my second favorite wood species after ash, but also getting scarce so I understand why Okoume is now being used as a substitute.
all just this guy's views, FWIW.