I saw all three last year (HEA, Hallowishes and Holiday Wishes). HEA is jaw-dropping amazing. The projections and fireworks are simply unbelievably stunning. I know people miss Wishes, but, visually, HEA blows it out of the water, IMHO. Hallowishes is still a lot of fun! But once you've seen the HEA projections, you will understand how very outdated the technology in the remaining "Wishes" shows are. Holiday Wishes really pales in comparison to HEA at this point, IMHO. If I had to list the shows in order of preference it would be HEA, Hallowishes and Holiday Wishes.
I would definitely make a plan to see HEA. IMHO, it's the best nighttime show, currently, in all of WDW.