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Seven Seas is actually going to be releasing it in English next year! Here is a link to the first volume on amazon.
Here is the manga https://www.amazon.com/Devilman-Classic-Collection-Vol-1/dp/162692757X and https://www.amazon.com/Devilman-Classic-Collection-Vol-2/dp/1626928959
I was able to find it on Amazon here... I'm 90% sure it's the original (also new to the franchise but did a little research lol so I should be correct...!):
if you were looking for an online read, here is a site:
(again, 90% sure this is the 'original'! Someone correct me if I'm wrong!)
Hope this helps...!
In that case you should get Devilman: The Classic Collection. It's 2 volumes.
Pre-order link on Amazon for the first omnibus just went live. Looks like it's due out on March 8.