I doubt there is much difference now considering wood for aquariams in better treated then it would have been when the hobby was smaller, but before then actual "bog" wood would have been better as the acids created from a peatbog would have a natural "treatment" like effect on the wood, almost pickling it, and making in more rot ressistant. Though I would seriously doubt all but the most infomed and honest aquaraim wood supliers would even know where exactly there would came from and would otherwise just through around bogwood, driftwood, ect as snonmyns.