Not sure what you mean by "compliment". Guessing probably 'alternate'.
The BAD would be the most similar to a Large Sebenza. Most of the other AD permutations are much stouter.
The .14 GW's are stouter than the BAD's, and more blunt in profile, so less delicate, but not as good for piercing and slicing.
You may want to get both, and just live with them for a while in order to form opinions. You may want to consider modding on them (taking a little belly out of the GW, grinding down the but of the xAD, etc.). You'll also probably want to play around with different carry systems, as this is a major issue relative to the Sebenza... probably the main potential disadvantage of the fixed blade.
Lately, I've been carrying a .14 GW in a leather pouch sheath, with an IWB clip. Most of the time this rides in the strong-side tool pocket of carpenter's pants. I also have Kydex for all my small fixed blades, including the BAD's and GW's. Still lean more toward the Sebenza for the office/meeting type of environment.
It's just a very personal set of choices. There is no one perfect solution, and your opinion will probably drift some with time.