No one.
Harris was 18th in the league in assists per 48 and 17th in A/TO ratio. That's not bad by any means.
Lowry had 9.86 assists per 48 (12th in the league) but just a 2.36 A:TO (bad for only 32nd in the league), was 40.9% from the field (way worse than Harris 44.5%) and was 37.4% ( a little better than Harris' 36.2%) from three with 4.6 rebounds and 1.6 steals. The latter two were both much better though our rebounding studs don't help Harris' numbers there. In any case, Lowry is a worse shooter, turns the ball over more, and has marginally better assists numbers. To me, he's not really an upgrade and to pay him 26M over 4 years or something is not only unwise as far as our books go right now, but also stupid going forward in that it would prohibit us from signing someone who truly helps a year or two later. A true difference maker. It's also silly from a roster perspective in that we at least know what we get with Harris. There's no drama there. He doesn't bitch about getting weak minutes for a starter. He's a decent human being. With Lowry, we might get a shipwreck if things don't go as hoped for all involved. It just doesn't make sense. None of these FA points do.
If we get the GS pick, go after Marshall. If we don't get it, consider someone like Machado in the 2nd round. There's no rush. We're young.
Except that a pass-first PG could bring them along much better than not having one. Otherwise, I agree.