Neither. I like the Manga. OVA female designs are atrocious. I swear nobody can draw a decent Integral or Seras other than Kouta Hirano. They also cut down Master of the Monster flashback which was the best thing from volume 1. I wanted to see Integra cuddling corpseAlucard. TV series is... different, not bad, but different. Their treatment of female characters is disgusting in the end.
Compare Seras' and Integra's fates in both:
In the Tv series, towards the end, Integra gets nearly raped twice, she almost dies and turns into a ghoul, then is framed and betrayed, abandoned by the Queen, put in prison, her organization is disbanded, her family name is spoiled. She's pretty much a damsel in distress to be rescued by Alucard or Seras. Ugh. In the Manga, on the other hand,
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Integra wins the war, kills the Major (aka the Big Boss) by herself after he "defeated" Alucard, loses an eye but nothing else, then becomes the mentor of the descendants of other dead knights, remaining even more important in power than before, everything is rebuilt. Her happiness is complete after Alucard returns to her, after battling against MILLIONS, all wrapped up in a happy ending.
In the Tv series, towards the end, Seras fails and Ferguson and Helena die, then fights a little with some crappy boss, but gets gunned down when tries to help Alucard. She "drinks" his blood like she did with Ferguson's, not a hint of power or maturity, nothing. She fades away after helping Integra.
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In the manga, she becomes Alucard's successor and Integra's servant, a powerful vampire after she sucks Pip's blood (who "died" to save her), that makes him undead (as part of herself). So, they share immortality together (he can leave her body whenever he pleases), they crush Zorin Blitz and Captain, then have Iscariot's fear as a great enemy. She's absolutely happy in the ending, with Pip around as shadows, together are the only thing Integra needs in the headquarters.
Seras and Integra are the true heroes in the Manga while they are made supporting damsels in the TV series. This was what made me more angry.