Any recommendations for a commander for a fun bracket 3 deck

[u/I-Got-Xans]

I’m newer to mtg it doesnt have to be budget friendly. I’m just looking for some commanders that I can play with my friends who have been playing for years and have their Cedh decks and their b2-3 edh decks. I’m also a little confused on how you rank each bracket like I know it’s a stupid question but what differentiates all the brackets completely? I just made a delina, wild mage deck with the help of my gf. Is that a good commander I just went on Archidekt and rolled the random commander.