Looking on the internet deeply has found these results:

He was one of the best people I have ever met in my life is the most popular phrase on the web.

He was one of the best persons I have ever met in my life 12 results on the web	He was one of the best people I have ever met in my life 115,500 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	He is one of the best people on the planet. And, by the way, she's one of the best people on the face of the planet that you could ever meet. About the time he get my age, he be one of the best people out. Probably one of the best people you'll ever meet. You're one of the best people there ever was. ...I want you to know you're one of the best people we've got. She's one of the best people I know. Haas is considered one of the best logistics people in Iraq.

He was one of the best persons I have ever met in my life

12 results on the web

He was one of the best people I have ever met in my life

115,500 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

He is one of the best people on the planet.
And, by the way, she's one of the best people on the face of the planet that you could ever meet.
About the time he get my age, he be one of the best people out.
Probably one of the best people you'll ever meet.
You're one of the best people there ever was.
...I want you to know you're one of the best people we've got.
She's one of the best people I know.
Haas is considered one of the best logistics people in Iraq.