This is a great GTKY!!! I'm going to list a few, but mainly because I think I never give him enough credit for being such a great H.
I think my top one would be unwavering support. Years ago I took a break from industry to pay my dues in the consulting world. I made the mistake of doing this while I was finishing my MBA. I was so miserable in the role that I would cry every morning before I left for work. At the time my workday was 8am - ~1am, but I did pull multiple all nighters, and it drove me mad. I would leave for 3 hours to take class, return to the office, schlep home in the middle of the night, and only see my husband for a few minutes in the morning. He begged me to quit the job and to move back to industry. Every day he asked me to leave, sent me spreadsheets showing that we would be financially stable and continue to save with just his income.
DH isn't very emotional, but since we have decided to TTC, things have changed a bit. He goes out of his way to tell me he loves me, to touch me, and to just generally be there at all times. Months ago we decided to kick off TTC in December, and on December 1st he busted in the door after work reminding me of the date. It was like a switch flipped and he was suddenly ready and 200% eager to grow our family.
He's different from the majority of men in our area. He would rather do things himself than pay others to do it, he consults me about large purchases and says it's 'our money', rather than his money (despite the fact he makes quite a bit more), he's a huge advocate for my career, and most importantly, he's humble. I meet so many men in finance or with his education that are the arrogant jerks, and I am proud that my husband does not fit into that camp.