In general, (and IMO), raters put a lot of emphasis on what guards do with the ball in their hands, ball handling in particular. To a certain extent that is understandable since they have the ball in their hands a great deal on most teams. UConn's guards however don't do a lot of fancy dribble moves as UConn is much more of a passing team. UConn guards, except for transitions, pass far more often than they dribble. You rarely see any UConn player dribble more than 3 times before either shooting or passing. So guards that find open team mates and who can play without the ball are more valuable in Storrs than someone who has great spin moves.
I haven't seem Hailey Van Lith much in game situations but I have seen Bueckers. She is to my eye significantly longer, both in height and in reach. Her length gives her an advantage defending away from the ball as she deflects and intercepts a lot of passes. It also allows her to rise higher on drives to the hoop.
But then I have been high on Bueckers for about 2 years and once I fall in love with a player it's hard to talk me off them. Beyond skills I love her on-court attitude, confident, in fact unintimidatable (is that a word?), bordering on cockiness. She looks like there is nowhere in the world she would rather be.
I see Hailey Van Lith taking over at Oregon when Ionescu graduates. No knowledge, just a hunch.