Both of these 
USB Type-B 4 life!
Yeah, even for All Spice, it seems like: pick the format that:
- has a big market
- has customers willing to pay money for services (ie medium to large businesses)
- has history of acquiring enhancement tools and rolling them into a product.
Altium easily checks all of those boxes (back to Luke’s feifdom).
But really it is cool to support KiCad,the use of that tool is growing for sure and I think something like Eagle for example is flat/shrinking.