Saga 1: Seasons 1-4 aka the High School Years of Clark Kent (villains were Lionel Luthor and the Teagues)
Saga 2: Season 5-7 aka Clark's training begins (Brainiac, Bizzaro, and Lex Luthor) and Lex Luthor's descension to darkness
Saga 3: Seasons 8-10 aka The Final Trials of Clark Kent (Doomsday, Zod, Lex Luthor, and Darkseid)
Personally story wise mixed together I liked the final trials mainly zod and darkseid tho. The High School years were more connected kinda fun for high school and Saga 2 had probably the best development of characters. Overall I liked the Final Trials better.