I've seen Ayu 5 times over the years, and honestly I've never been to a performance that her vocals were not good. In order of best to worst, I think I would rate them:
1 - TA 2015 (Birthday Date). She struggled a tiny bit with the high notes in Unite and maybe Heartplace was a little scream-y, but that was all.
2 - PoM 2018 (Fukuoka). Her vocals were great the entire show, and I can't think of a single song that sounded forced or like she was struggling.
3 - TA 2016 (Day Before Finale). Strong vocals again, but her voice was a little thinner on the acapella of Teddy Bear. She also relied on backing track a lot for this tour.
4 - TA 2016 (Finale). Not much change from the day before, but a little bit worse.
5 - CDL 04-05 (Day Before NYE). Her vocals were good here, but I think she lipsynced Duty and M pretty obviously (the sound levels were completely different). Her pitch was really good in this show, and overall I have no complaints...but she was sort of in a transitional phase of her voice where she was moving into her deeper register, but wasn't quite there yet. So while I love songs like Carols, I think they have a unique vocal quality to them that I can't quite compare to after this time when her voice settled in a deeper place.
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