I think the EK43 is a little easier to use for espresso, and more people have figured out workflows on their bars or in their homes due to the EK's crazy popularity. The EK43 I owned was bought used but I aligned it as best as I could with shims and the Titus tool. I never tried the sanding method as I lost interest chasing the EK dragon and moved on. The shop I worked at had a brand new 2018 EK43, aligned at the Counter Culture Lab in town, which I used for comparison.
The EK43 for espresso on bar was not able to choke a La Marzocco Linea PB even on its finest setting. Shots tasted really good but would rarely ever run longer than 35-40 seconds. The Ditting by comparison, when set to "Turkish" or 100 microns, will without question choke a commercial espresso machine. I've had shot times of over 80 seconds. The Ditting can do the EKspresso style shot with sweetness and clarity too. I think the LAB SWEET/PEAK style burrs are even better as the body of shots is richer and the depth of flavor is nuts. Again, those were my visceral reactions after tasting.
I was happy with the EK for espresso but I didn't care for it on filter coffee as much. I had my Ditting (machined burrs) and EK43 side by side for pour-overs and cold coffees and enjoyed the Ditting more. When I tested the PEAK burrs in the Ditting I simply fell in love. I rarely experience that kind of emotional reaction to drinking coffee, and I don't recall having it when I drank coffee ground on the EK. Maybe blame the coffee, maybe blame the barista, I don't know. I have noticed that there are a lot of coffee shops around me that use EK's on bar and I don't think any of them really stand out or make the kind of coffee we read about, with buckets of sweetness and clarity and juiciness and crisp acidity and...
Interestingly enough at the Counter Culture Lab in Chicago, they use a Ditting 804 for their catalog/industry cupping despite having an EK43.
It seems like I'm really selling the Ditting here. I can't say what is best for you, or what you will like. I can tell you that there are other grinders that give the EK a run for its money and worth considering.