Well Al, that's a very good question, but it's somewhat akin to asking me which of my daughters I prefer. And you know, I would never openly say I preferred one over the other, and even when discussing the obvious differences, I would choose my words carefully, so as not to hurt the feelings of one or the other. I love them both the same.
But, having said that, it is clear that the Distillate is going to be much more comfortable to play, due to the light weight and medium scale. I admit my old back is not what it used to be, and carrying the heavy Orion around for a couple of hours at a time is a bit of a strain, but I won't have any trouble with the Distillate.
And the reach on the medium scale is so much more comfortable too. The medium scale will take a bit of getting used to, but not too much I think. The difference between long and medium scale is not a subtle one, as I thought it might be. It's a big difference. But at the low frets, it feels perfectly natural already. I love it! The higher frets, above the 8th or 9th or so, start to feel a bit cramped, but I think I will get used to that soon enough.
They both have equally nice action on the fretboard, but of course the neck of the Distallate is much more slender and more comfortable to play.
I also, personally, still find 4 strings more comfortable than 5. I find the 5th string to be fascinating and fun to play with, but not essential for most of the music my band plays. Perhaps after 25 years of playing nothing but 4 string basses, well, you know what they say about old dogs.
The sound and tone of both basses is excellent, of course, but they are noticably different. With the Orion's custom electronics, it pretty much has as wide a range of tones as the Distillate does. But the tones across the range are different on each bass. The Orion seems to be deeper, and growlier (if that is a word) while the Distillate is brighter and punchier. But basically, you can't dial in a bad tone on either bass.
So anyway, due to the comfort issues, I fully expect the Distillate to be the workhorse I play the majority of the time. That's why I bought it. But the Orion is not going to collect dust either.
Curt