Both are not Free and Open Source Software. They aren't even Open Source, forget free (as in freedom to see source code).
Also IMHO, Adobe Premiere Pro and/or Sony Vegas Pro both can not match FCP. Both are good for end-users who like to make movies at home without spending lakhs of rupees on editing rigs. But no match for FCP.
FCP competes more with Avid than Adobe/Sony for editing purposes.
Hope that answered your query. I have used Premiere Pro and Avid. So feel free to ask any more.
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