Following an excruciating cliffhanger, Star Wars fans didn't have to wait long to discover Grogu's choice; in "Chapter 7: In the Name of Honor," viewers are brought to Peli Motto's hangar, where R2-D2's starfighter delivers Grogu, who is donning his brand-new chainmail shirt.
Peli then travels to the city, hoping to reunite Grogu with Mando. After finding Mando amid the war against the Pykes, Peli reveals Grogu to Mando, who immediately goes into full dad mode in hopes of protecting the youngling from harm. The two share an emotional reunion, which ends with Mando noticing Grogu is wearing the chainmail armor.
Obviously, Grogu chose the armor because he and Mando built an incredibly sturdy bond. After Mando finds Grogu in Episode 1 of The Mandalorian, the bounty hunter vows to protect the child at all costs.
Despite leaving Mando's care at the end of Season 2, Grogu still possessed a strong attachment to his father figure. And, when presented with the chance to return to the person he loves the most, Grogu couldn't refuse.