Favorite Chapters:
467/468/469 - Mother's Key/Star Memory/What I Want To Do: easily one of my favorite subplots this arc, not only that it shined lights on Brandish as a character but also opened a path for Lucy to grow even more, finding her resolve. As much as Lucy spending her whole year tracking down FT members melted my heart, I'd like her to be more dependent on herself, and an Aquarius tracking journey in the future totally fits what I want.
470 - Hybrid Theory: Acnologia, enough said
474/475/476 - In The Moment of Complete Silent/DiMaria Chronos Yesta/Farewell, Magical Girl: Chelia, enough said. I'm happy that Wendy has someone else to care for her besides Charle. Chelia feels more like Wendy's friend, Charle I think tries to act like her mother, and sometimes that's not exactly what Wendy needs.
477/478/479 - Transport/Stealth/Who You Should Show the Greatest Respect To is...: A relaxing NaLuHap battle never fails to bring a smile to my face, I wonder why peeps keep saying it's ruined the hype when there's no hype in the first place, Jacob has
always meant to be a gag character, not a serious one.
480 - Grave Markers of the North: gotta say, that scene took me by surprise, well done, Mashima
492/493 - Older and Younger Sisters/The White Dragneel: I always love Mira's fight, so I'm glad that she had the chance to give us a good show, and Mira's Satan forms' designs are
much better than Erza's amour, imo. Not to mention that we finally have our conclusion on Sorano&Yukino's sisterhood, which is adorable
495/496 - I'm Hungry/Forward!!!: Gildarts, that's enough for the chapters to make my list. Plus, not many people noticed, but we actually have
Romeo's character development in chapter 496. The little boy has always been so insecure in his whole life, from having a weak-ass dad to his only idol disappearing for 7 years straight, leaving him behind with no trace. Seeing him got motivated to join in the fight is heart-warming, and those little moments make me appreciate Mashima's characters more
501 - Mari and Randi: this chapter was just...too awesome...beyond words. Not only did it make me love Lucy even
more, it also made me appreciate Brandish as a character, and I love seeing how conflict she was with her feelings, that was very realistic, imo
503 - The Last Sight Seen: if all of her previous fights didn't
somehow show that Lucy has grown to be more of a fighter, this chapter nailed it. Seeing Lucy threatening DiMaria to just get on with gauging her eyes out brings me back to a shaky Lucy in front of Zero, too terrified to do anything and just stood there to be attacked. Lucy has come a long way to be who she is now, and I'm happy to see that, plus we got to see partial END, and his design was awesome
505 - Trump Card: this is more taste, I think, because I didn't give a shit when Gajeel and Juvia "died", so this chapter actually hit me, that we can never see Makarov ever again. He went out like a champion, a hero, and he will always be missed, such a nice way to end his journey.
509/510/511/512 - Kagura vs.Larcade/Natsu's Heart/Hunger Hell/Sting the White Shadow Dragon: it feels nice to actually see side characters fight against baddies that are usually meant for FT members only, their teamwork flows nicely and it gives Sting and Kagura conclusions to their character arcs. Sting learn to treasure his guildmates and Kagura learn to stop bearing grudges, not to mention we now have Larcade's mystery that has yet to be solved, even more fun. And Natsu's Heart journey has officially become what I look forward to most whenever new chapters are released.
Least Favorite Chapters:
481/482/483 - Historia of Corpses/Vigor/The Seven Stars: besides Kagura's resolve, I can't even look at those pages without cringing, so bad, so bad
486/487/488 - The Forth Guest/The Third Seal/Two of us...something: not only that Cana's precious screentime was not enough, this girl gets to fight a Spriggan

Her relevancy should just only be at Lisanna's level, and now she keeps getting shoved into my face

not to mention Gajeel's turned into a cheesy lame lovestruck teenager who only cares about her, rather than the Gajeel was willing to forget his pride for a moment in order to help Natsu fight against Laxus

Such a waste
498/499/500 - Gray vs.Invel/Gray and Juvia/Fire and Ice: no, just...just no
513/514/515/516 - Flower Circle/Dragon Seed/I Am You, You Are Me/The Truth About Enchanment: it's not like I had high expectation for Irene's fight to blow my mind, but somehow I'm still disappointed

of all things,
Dragons have to be involved, but oh well, what's done is done. I still think there's a way to end her story perfectly, but I hope Mashima doesn't make it too cringe-worthy.
The other chapters are normal to "meh" for me, only those stood out. I actually don't have much problem with Laxus fight, to me, it shows more character than feats, and I'm good with that. Most people are pissed at Gray vs.partial END fight but it only made me more curious about what END is as a whole demon, so it was a nice tease (for END fans)