Seriously, all joking aside, the only way to develop genuine comfort in decisions like this is to take real world data. Take one of each size and carry them both, use them both, as often as possible. Swap them around in pockets and sheaths. Cut stuff. Slice tomatoes. Do not be swayed by aesthetics. Put another way, use like for like. Do not have a Small with Micarta and a Large with Mammoth Bark Ivory with a Damascus blade. Yes, this needs to be done with both, simultaneously. I dare say that you will come to appreciate the merits of both. And if you decide that it is definitely one size versus the other and not both, one good thing about Sebenzas is that with proper care due any expensive tool, they hold remarkable resale value.
Just do it. And do not be surprised if you perfect EDC turns out to be a Nyala and not a Sebenza.