The biggest hurdle of all vs. The major hurdle of all

English as a Second Language English Vocabulary, Grammar and Idioms
1

“In the US, you can drive thousands of miles west to east without changing countries, but the Briton first has to cross the Channel - which often proves to be the biggest hurdle of all.”

Can i say “… which often proves to be the major hurdle of all” as well?

Thanks in advance. Greetings.

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2

Biggest.

You can use ‘major’ with a different structure.

…which proves to be a major hurdle.

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3

I think you can say, "… which often proves to be one of the major hurdles” but the meaning conveyed by ‘biggest’ will be lost.

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