Had the opportunity to add a new ride to the stable and decided on a 2020 Civic Si. Why would I want to own both? I couldn't really tell you other than the fact that I just love cars! I'm hoping to do an in-depth comparison between the two at some point but I still need more seat time with the Si as I only have about a hundred miles on it so far. Performance-wise, I think they are neck and neck. But when it comes to creature comforts, the Si definitely takes the lead. It's got a bunch of goodies (even more-so with the 2020 models) that I'm still learning how to use. Just know that the ST is good enough that I refused to trade/sell it to obtain the Si. I'd much rather own both 
