I think Ingram is every bit as good as Brown. He is a better outside shooter and a much better passer, both of which make him a better off the ball player and a better fit with Tatum.
First of all, this is a really interesting comparison. Since they went 2-3 in the same draft and are both starting wings there is a lot of basis for it; and since a lot of their statistics are similar it looks worth a deeper dive.
I like to play GM, and a GM is always making choices between two players; but I don't subscribe to the usual one-dimensional rankings that people use. Even if you just use hard numbers, no matter how sophisticated (problematic, but understandable - and I guess you have to start somewhere), you seldom have an equal basis for comparing two players. With Jaylen vs. Brandon, there's at least an argument for comparability.
But let's compare as equally as we can. If you use Ingram's 22-23 stats, it's hard to justify, since he's only played 15 games; while his 3-pt% is at a gaudy .427, for example, that is way out of line with his previous season or his career norms. As a basis for comparison, it's most logical to compare their most recent full seasons, i.e. 21-22.
As usual, Jaylen logged more minutes and more games played, so per game and total numbers have to be adjusted for, but what else can we do? And it's much better than comparing Brandon's few games this season to a big body of work from Jaylen.
Brown is better defensively, but I think Ingram's more versatile offensive skill set and better shooter overall give him a slight edge as a player.
I agree that Brown is better defensively (I would say "much better", but that's something I don't have good means to quantify) - but less versatile on offense? Better shooter?!
Firstly to the most obvious numbers: Jaylen shot a tick over league-average from 3, at .358, while Brandon shot below replacement, at .327. Furthermore, Jaylen had to create more of those shots himself (.759 vs. .892 assisted) off the dribble, meaning that they were on the whole more difficult shots.
Brandon shot a replacement .501 from two, vs. Jaylen's .544. Jaylen got to the rim more often, and was a much better finisher, apropos of versatility. Brandon had a make at the rim every 19.9 minutes, while Jaylen had one every 16.8 minutes.
Jaylen is a better ballhandler. He has more repertoire and more moves, and he attacks more. Even as he got to the rim more often, he also had fewer offensive fouls; and it wasn't close: at one every 123.3 minutes compared to Ingram's 81.3, he was almost exactly 50% better.
By considering only the 21-22 season we are not accounting for Jaylen's remarkable new effectiveness this year on both short and long midrange shots - again apropos of his versatility.
On the other hand, Ingram got lots of his points at the line, sporting a golden .329 FTr and an A-plus FT% of .826 - compared to Jaylen at a middling .261 FTr and a grade-B FT% of .758. This is the one shooting area - and an important one - where Brandon was better.
You say that Brandon is a better passer; here you're on firmer ground, I think. Obviously AST% is a proxy for that, though an imperfect one; and here Brandon has a clear advantage. He had a point guard number of 27.8; if he were on the Celtics he'd have only Marcus Smart to beat. While that's a stark outlier in his career, he did sustain that for the 55 games he played; and his career average of 18.4 is still better than Jaylen's best, which he logged in 21-22.
Jaylen's 17.9 is a respectable number for a scoring wing, but clearly a level below Ingram. On the other hand, Jaylen had a substantially better season for bad passes; he threw a bad pass every 30 minutes, while Brandon had one every 27.9, dulling some of the luster of his AST% advantage.
Ingram, though, is hurt and they haven't really said when he will back (though he is apparently practicing). ... so that is concerning.
I agree, it's concerning. Unfortunately, this is a career-long pattern for him. I'm always reluctant to label a player as "fragile" - there are just too many exceptions and too much unpredictable random stuff that goes on in an NBA season - but he hasn't played more than 62 games since he was a rookie.
And while you couldn't call Jaylen Brown an Ironman, it's looking like he'll have played a season's worth of games in his career more than Ingram by the end of this season (the gap is currently 62 games); of course that is only in the regular season, and obviously if you include playoffs games Brown is miles ahead).
Brown's clear superiority on the defensive end is a more critical part of his value for the Boston Celtics for me, perhaps, than for you, I think. Perhaps I overvalue it - I see it as contributing to everyone's sense of shared sacrifice, not just an individual contribution to winning on the court. It makes a difference in the dog days late in the season when everyone's beat up and searching their hearts for another effort on another possession.