Welding cable/what's the good stuff ?

Hey guys, I'm looking to buy some wire for my upcoming build. I'm thinking of getting welding cable but not sure where to get it from. I have seen some on eBay but not sure if it's any good? If someone has used some good welding cable please let me know where I should look. Has anyone herd do the class M welding cable
https://www.wireandcableyourway.com/1-0-welding-cable-class-m-ul-csa.html

Looks good but definitely more expensive.

Also I have heard that 1/0 welding cable is smaller then 1/0 car audio wire. Will the 1/0 welding cable handle 2000 watts? Or should I step up to 2/0 ? I used some of the knukonceptz 1/0 (over sized) wire and it barely fit any of my 1/0 gauge connections. Such a pain in the butt.

Any help would be greatly appreciated.

P.s. I tried searching but get an error message every time I try

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eb flex is the winner hands down.

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**** you guys are fast lol. Thanks for the quick reply. Ok so if I get the 2/0 that is suggested will it fit it my 1/0 distribution block and should I buy 1/0 compression lugs or 2/0 ? Jeff where did you get that chart would like to read the article or post that goes with that

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Oh how I forget EB Flex smh an that's what I use to lol

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Where did you purchase your EB-flex from?

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Because the welding cable run smaller should I up the #4 gauge to a #2 gauge

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