[maverick2007]

Certain modern(-ish) roller coasters do have more circular loops than others. Specifically Schwarzkopf[1] coasters are famous for having more circular loops (and the more intense positive Gs that come with it). Anyone in the Bay Area might remember Zonga[2] at Six Flags Discovery Kingdom which featured the more circular loops.

Also maybe of interest is Blue Flash [3], a backyard roller coaster that has a loop that reminds me of old school circular loops.

[1] https://rcdb.com/6844.htm

[2] https://en.wikipedia.org/wiki/Tsunami_(roller_coaster)

[3] https://www.atlasobscura.com/places/blue-flash-backyard-roll...

[Doxin]

Honorable mention for the ill-advised looping slide at action park[0]

[0] https://i.imgur.com/Bs4Hs3E.jpg