Not very specific. Fist fight, Eren. ODM, Mikasa. All out, no holds barred, I'd give it to Eren. With the War Hammer, his increased skill (it's been implied multiple times that Eren spent a crap-ton amount of time training during the timeskip), as well as his more composed, calculating and analytical mindset, I think he has the better shot of winning. Plus, he himself has great knowledge of ODM gear and its combat applications, so he wouldn't be as caught off guard as some of the Warriors (Zeke, Willy's sister, and Pieck).
Mh ... I think instead that now Eren, even in human form, is stronger than Mikasa. In fact, I calculated that in terms of physical strength (most important skill for using ODM), Eren is 2-8 times stronger than levi.