Lumpkin is excited about the opportunities that he would have at both of his top schools, but also noted the differences between the two.
"I think at Northwestern I would get to help get them to their first NCAA Tournament, but at Stanford I would just be apart of something they already have going," he said.
In the spring, NU head coach Bill Carmody took over as Lumpkin's lead recruiter, and the two have built a strong relationship.
Lumpkin said he isn't leaning toward either school right now and spoke highly of both of them.
"They stick out as favorites because I have good relationships with both coaches," he said. "They're the two campuses I've been to the most and they're the only elite campus that I went to. They're both great schools, both top academic schools, and both can set me up for life after college and wherever basketball takes me."
Academics will be a big part of Lumpkin's decision, as will his relationship with the coaching staff.
"(I'm looking for) a school that I can fit into the system well, play the best basketball I can, and (a school where) I have a great relationship with the coaches that feels like a second home," he said. "And (I want) a great academic school so I can be set for life wherever happens, and I want to play where I get chance to play and become best player I can be."
Lumpkin seemed to feel Northwestern and Stanford possessed those qualities and he has been to both campuses twice. He was impressed by his visits to Evanston.
"The first time I went there was when it was still cold outside and I saw the whole campus and all that stuff," he said. "The second time I got to sit down with Coach Carmody and I met all the players and that was really cool. Tre Demps really reached out to me. He gave me his number and we've been texting and stuff. It felt right while we were there. It was a good experience; I'm glad I went."
Lumpkin isn't sure whether he will take his official visits, as he feels he has seen both of his top two schools enough to make a decision. He hopes to make that decision relatively soon.
"I want to try to get it done before basketball season starts for sure, but probably as soon as possible after the July evaluation period," he said.