I'd go SnG all the way....and I do, every day. the s30v on the sng is real well done, i think the heat treat on the s30v is a little "softer" on the sebenzas. I've used the sng on my job to pry sheet metal on cars, cut tough fender liners off of tires so a car can drive and other assorted stuff. works great. sebenza is a great tool as well. i like the commanders, however they are not as utilitarian as the sng or sebenza...plus if you pull it out in a crowd to do something you will get more looks than a plain jane sebenza or a cool sng. i would not hesitate to carry a sebenza or a sng..but if you need one of those for defense, you are in some deep poop brother!
as for tanto or spearpoint, i find tanto's easier to keep sharp and may have an edge with a defensive knife. also the primary edge on the tanto is straight, as opposed to the curved edge on the spearpoint. that being said, i still carry a spearpoint. because it's what MattD had in stock at the time.
there are so far 3 models of SnG's...i've heard they will be 4 models, but am unsure.
1st model had tiger stripes, (for the most pars, a few were just bead blasted), swirled green and black g10 with the ti side anodized in a real cool swirl camo patterns. I have spearpoint #46 of this run...
2nd run had black g10 (smooth) and stonewashed /tumbled blades. The ti side was tumbled as well. these knives make good users, as they show pretty much no wear.
3rd run is the latest, it has black g10 that is grippy like that on the AR/GB folders and the EB series...blade (tanto and spear) are a black oxide, as is the ti side for a totally black knife.
there are a few odd lots in all the different runs...for example mine has a polished clip instead of the matte finish-which makes the swirls look cool...I think there are only 2 like this. some of the 1st runs may have a dark anodized ti with no swirl...i guess it depends on what "the guys" feel like doing at the time they are done. keep in mind all these knives are essentially hand made and hand fitted.
if you want a user that can go with you everywhere, that is dependable as it gets, you can't beat a SnG in my opinion.
if the sebenza was made in a size between the small and large sebenza i'd carry one more. carried a large for over a year and a small for about the same. large was a bit too much, and small was a bit small for me. the ergs of the SnG fit me just right.
the Reeve's are top notch nice people-customer service is great and people don't come any nicer than Chris and Anne.