Definitely undergrad. I still have close friendships from both college and law school, but I felt more a part of the institution in college--I was involved in more clubs/activities, I went to more sporting events and university events, etc. Law school was more of a bubble where we mostly only interacted with the law school rather than the university as a whole.

I feel no strong connection to either institution, but I have maintained close friendships from both undergrad (big state school) and graduate school (different big state school).

I graduated from undergrad ~30 years ago.

Residency training > med school > undergrad

I feel equally disconnected to both!

College (Penn) and Law school (Stanford).

I mentioned names just to demonstrate their logos don't necessarily mean you'll feel a stronger connection or affiliation - at least in my case I feel I had a pretty transactional relationship with both.

Also undergrad by far (SLAC) vs. business school

Undergrad by far (WASP SLAC) compared to my law school and grad school.

Graduate.

Went to big state school for undergrad, never kept up with anyone from there.

Undergraduate school. It's where I got my first taste of pseudo-independence/freedom, where I developed a love for college football, and where I got my @rse kicked academically but learned how to deal with the fact that there are lots of people way more intelligent than I am, and that was a good lesson to learn fairly early on.

Graduate school was great too, but my undergrad school will always be my first love.

Another vote for law school. It was smaller, I had a great group of friends, and while we're not in great touch, we just pick back up right where we left off. It probably helps that we're all (most at least) in the same profession so we have more in common.

I have a BA, a JD, and an MFA in creative writing. Got them in that order.

I feel most connected to my law school.

Grad school.

Undergrad. It's where I was most involved in social activities, made more friends (including my spouse), and enjoyed my classes more.

I went to law school, but I didn't really connect with people very much. The career focused nature of it also made it less conducive (for me) to finding what I was doing interesting. The lazy days of sitting around reading old books and talking about them, in and out of the classroom, was where I was happiest.

Undergrad. I wasn’t nearly as connected to social life in grad school.

Graduate.

I come from a blue collar family, that jumped at the first free ride I was offered for undergrad. No thought was put into fit.

For graduate school, I had more agency and went better places.

I feel about equally connected to both.