Quite a few Alto's were sold and used in various industries, so it was a commercial product - perhaps not a personal computer like the one you would use at home. It probably was too expensive for that, likewise was the offerings from Apple and thus the IBM PC outsold them by a long shot.
The Xerox was first and it was a good commercial product. SmallTalk was a conceptual language in the 50's because there was not sufficient processing power to develop an OO language - but in due time it did happen - at Xerox - on the Alto. Apple and Microsoft did make similar products but only self loving smug hippies (read Steve Jobs) would be so vain as to claim someone stole the idea from them. The lord and saviour Bill Gates set the record straight when he once told a self loving smug hippie "No, Steve, I think it's more like we both have this rich neighbor named Xerox, and you broke in to steal the TV set, and you found out I'd been there first, and you said, 'Hey, that's not fair! I wanted to steal the TV set'".
Jy kan 'n Apple produk uit 'n d**s haal, maar jy kan nie die d**s uit 'n Apple user haal nie.