Top Ten Reasons Deep Purple Deserves More Credit for Creating Metal Than Black Sabbath

Not only screaming. Also that operatic vibe to Gillan's singing, later applied by Bruce Dickinson of Iron Maiden, and after Bruce - by most of the metal singers with clean vocals. Plus Gillan's powerful voice. Power matters in metal. Plus the aggression in his voice and his vocal range of 4 octaves. All these elements became inseparable parts of metal singing. Ozzy has no these things - no power, no aggression, etc.
Ian Gillan and not Ozzy was the vocal idol of Bruce Dickinson. And I'm pretty sure that Rob Halford of Judas Priest didn't get inspiration from Ozzy's singing, haha. Ozzy has no command of vocal technique.

Without a doubt. The solo to Highway Star was actually the first true metal solo, based on Bach-like chord sequences.
Also, before 1970, Deep Purple were a prog rock band, Black Sabbath were a blues rock band. And prog rock is much closer to metal than blues rock. This difference colored the style of the bands in 1970 and after that.

That's also the reason why In-A-Gadda-Da-Vida isn't metal, how some people say.

This has nothing to do with who invented metal. Have you forgotten about Doom Metal? That's a very slow genre, and Black Sabbath pretty much invented it.

Fireball, Hard Lovin' Man vs. any Black Sabbath song (maybe Children of the Grave is the fastest)

Definitely. It's so obvious. Also, it was Ritchie Blackmore and not Tony Iommi who first used tremolo picking - a picking style that became main picking style in extreme metal, and also in power metal. Tremolo picking is most common in black metal. And some people think that Black Sabbath invented extreme metal which is ridiculous. Just because the word "dying" is mentioned twice in "Sabbath Bloody Sabbath", it doesn't mean it's a death metal song.

Exactly. Iron Maiden was the band that made metal a thing and they sound nothing like Black Sabbath. They do sound closer to Deep Purple and Rainbow. The Trooper, for example, sounds nothing like Sweet Leaf, Sabbath Bloody Sabbath, etc.

The vocals don't sound like Black Sabbath. The guitar playing does not sound like Sabbath. The drums do not sound like Sabbath.

For me In Rock is a heavier album than Black Sabbath, too. And not only heavier but also closer to metal as we know it now. I hear more Black Sabbath influences in alternative rock, including grunge (but excluding Nirvana - they're more punk-ish), than in metal.
In Rock is more aggressive, faster and louder.

And they came out in the same year.

You could argue that In Rock was the first metal album (not saying it was, but still)

I never said he had introduced it to rock. I said, and I would say it again, Ian Paice introduced double bass drumming to metal. Currently, every modern metal band uses double bass drumming. Double bass drumming was used before him, but no other genre made use of it like metal did. The reason is that double bass drumming enables the drummer to play faster (get more beats per minute) and metal is a fast genre.

I think Keith Moon and Ginger Baker were the first of the major rock players to use drums with two bass drums. Having said that, neither of them used it the way Ian used it on Fireball.

I haven't heard this from Metal_Treasure, but I experience that metal songs with only one riff repeated the whole way, 2 verse-chorus structures and a guitar solo are quite rare compared to such hard rock songs, and most Black Sabbath songs are like that, in contrast to Child in Time, Pictures of Home or Lazy.

I agree with that. Deep Purple compositions are less monotonous because they have more development (both instrumental and vocal part) and later this also became a typical feature of a good deal of heavy metal compositions.

True. They are on the The Guinness Book of Records for that. Even though loudness does not define metal, we have to agree that metal tends to be loud. I'd like to praise Alkadikce for putting this item low namely because other genres can also be loud.