Strings I use.

BG66um in Blue or Red. For even greater power than BG80 at the cost of durability. Expect to re-string every two weeks. It is my favorite string though.

BG80 in Black or Pink. A rough and hard string that caters towards power players and smash spammers. A favorite by a majority of badminton players.

G-Tone 5 in White. A mix of BG80 and BG66um. A fun string to play with. Haven't played enough with this to form an opinion.

Li-Ning No.1 in Orange. For control type players who enjoy a medium-soft string. Recommended if you are a front doubles player, or prefer drop and net shots. That said, I don't use this string much.

Li-Ning N68 in Yellow. A newer version of the Li-Ning No.1 string. Haven't played enough with this to form an opinion.