I have a very long history of Speed Triple ownership, since I have a 1997 I bought in 1998 and now is into six-figure mileage. But of course it's so different from what you're looking at my experience is irrelevant.
I also got to ride both the 2018 Street Triple RS and 2018 Speed Triple RS. Of those, I would definitely choose the Street, but that's mostly down to personal preference and price. And those bikes are both too new to be relevant.
So in other words, I have nothing useful to add since everything I've ridden is either too old or too new, so I'll just show myself out now.