Finished reading Jedi Apprentice (JA) and Master and Apprentice (M&A); my personal opinion.
With heavy heart (/jk), I hereby say that I prefer M&A more than JA. There are 2, or maybe 3, reason for that.
I'm really bad at explaining things and english is not my native language, so I apologize beforehand.
First, characterization. Now, before anyone threw rocks at me, I'm not saying that JA do it worse, it's just to me, M&A Obi-Wan and Qui-Gon are more in line with their movies (prequels) counterparts. Obi-Wan, especially, with his still youthful and sometimes snoobish attitude.
(Though actually I think the best example would be Dooku. Legend/JA Dooku is straight up a jerk who is so paranoid against betrayal (which is quite funny considering how he later join the sith). Like, if he was obi's master, it is not hard to believe he will not go back to melida/daan to help obi; or at least he won't take him back as padawan. Meanwhile M&A Dooku clearly cares about his padawan, even if he's not showing it outwardly.)
Second would be.. the vibe. This is much harder to explain, and most likely would be too vague. Overall, to me JA kinda feels like Andor but written as YA story, while M&A is like... well, Star Wars or Clone Wars. Again, doesn't mean JA is bad, far from it.
Now, last reason is more of compilation of little nitpicks or purely subjective opinions. Biggest one would be that I pretty much dislike the concept of “initiates aging out”. Not only that it’s unnecessarily cruel, but also doesn’t really make sense. I prefer how canon treat the issue of “not everyone can be a jedi knight/consular (or whatever it is called)”. And that’s by having the order have specializations that are treated as equally important.
All that aside though, I have mix feeling with both JA and M&A to be honest. Namely due their nature as YA story, because when I see how some of the conflicts are resolved, I can’t help but think “oof that’s unrealistic and too easy”. Or how some characters (mostly the adults) are treated as objectively wrong, because they need to have “antagonists”. But ah, this is really my own fault in the end, for expecting something much more from YA books.