Take both of them.
Two months ago, I discovered the one-word+ai.com was still available, and I added it to my list of domains to register when my monthly domain budget was ready. I believe the domain name was important because I found a software development company that was using several domains related to that one-word name, all ending in .com, and a month ago the domain I had been eyeing was finally registered by that company, while the one-word.ai version still available on marketplace.