Jimenez hit about .350 with an over .200 ISO after being traded to the White Sox, and did that between high A and AA in his age 20 season. He's since carried same level of success over to the most advanced Dominican Winter League. I'd probably take Jimenez over Vlad at this point just because I value success at higher levels, but both are Top 3 prospects (along with Ronald Acuna, who is likely consensus #1) in all of baseball, so it's kind of splitting hairs. You guys have a lot to be excited about in Vlad Jr.
There's a roughly 50 point increase in BABIP from career average, a significant reduction in K rate that appears sustainable since his K rate actually improved over the year, an increase in hard contact rates, and an increase in fly ball rate. He also improved his physical conditioning, which showed most in his improved defensive metrics and infield hit rate (which helps to explain some of the BABIP increase). Everything in his numbers from 2017 suggests some regression is due, and while I suspect the average will experience some negative regression, I think there's a strong possibility of positive regression of his power numbers.