Watched the first 4:
Episode 1 - There's a lot to compare when it comes to the art and style of both versions alone. The 1999 version has a darker colour palette with better use of tones and some more realism in characters' faces, whereas the 2011 version has a more distinctive artstyle and uses its more vibrant, hyperbolised style to make it seem on the surface to be a lighthearted run of the mill Shonen in order to provide some juxtaposition when it comes to its darker subject matter and more unique ideas. Overall, I'd say the 2011 version is superior in terms of visuals for those reasons.
For the story within the initial episode though, I'd say the 1999 version is significantly better. The inclusion of Kite helps provide a better basis for what a Hunter is and is capable of as well as more reasoning as to why Gon wants to be one like his dad. Mito is far better in the '99 version as well with her desperately trying to stop Gon treading the same path as his father before conceding he is capable of his own choices in life, whereas her 2011 self didn't fully display the protesting against Gon's desire. The familial change of Mito to being the sister of Gon's mother rather than Ging's cousin seemed fairly pointless though. I imagine this version was trying to add extra stimulus to why Mito would fight Ging over custody of Gon after his mother's death, but I wouldn't say the idea of her having grown up with Ging and his constant absence for his own ideals gradually chipping away at her perception of him is any lesser a route for her character history.
Despite that, I wouldn't say it outranks the 2011 in every single manner. As I already said, the lighter tone of the remake makes the later revelations and change in tone have more impact as well as seeing Gon struggle after having initially been presented as basically an unstoppable force in the initial several episodes, compared to the 99 version providing him a lot of trial and error to succeed from Day 1 lessening that impact, making catching the Master of the Swamp without difficulty a better establishing point for that. That said, I can appreciate the 2011 version omitting those parts from its first episode to fit better with its tonal progression, with the main problem being not revealing them in a flashback properly.
Episode 2 - This episode does a good job showing Leorio's physical capabilities, though it's not as though the Hunter Exam wouldn't provide several instances to show his more than just an average Joe. The episode is overall just filler when considering things such as Leorio's desire for money and Kurapika's motivations would just be revealed in the following episode anyway and Gon's ability to bond with animals would have many other points to be established. The idea of his perception of what a Hunter is being shaken could have been interesting, but the Hunter being revealed to be a fake makes it overall pointless. Also, I don't know why Gon was so surprised at the Foxbear not being as gentle as Kon when the latter's parent almost killed Gon
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Episodes 3 and 4 - These can both be placed in the same category of being slow paced and padded compared to the 2011 version, being quite inferior to episodes 1 and 2 of that. The only major inclusions in Episode 3 were Gatso's fight scene and the imagery of Ging, neither of which were necessary when the former doesn't fully show the capabilities expected of those taking the exam as well as what we'd already seen of Gon and the latter would have the idea of how much Gon is like his father repeated ad-nauseam all throughout the series anyway.
The increased role of Mashu in this version was not only pointless, but contradictive. How exactly would Leorio not be immediately suspicious of the guy who told him to get on the bus ride that both sent him the wrong way and almost killed him? Moreover, how did Leorio even get to the group so quickly with the head start they had and was able to find there exact location without anywhere close to the senses Gona and Kurapika have?
The test and Gon's attitude after it in both versions is interesting to think about. Perhaps this was foreshadowing to Kurapika being forced to pick betweeen vengeance and saving his friends during the climax of the Yorknew Arc?