Icebox - viper, sage, sova, jett, Reyna - the classic sentinel lineup
Split - sage, killjoy/cypher, raze, astra, breach - I feel breach is underused even though his ult literally covers entire site.
Ascent - skye, astra, jett, sova, cypher/killjoy.
Bind - viper, raze, skye, sova, astra/brimstone. - switching out one of the controllers for sage is also good. So instead of viper - sage or instead of astra- sage.
Haven - jett, skye, astra, sova, cypher/killjoy. - haven’t seen enough of kay/o, if 100t plays against like fns, or nats, they would be so screwed by the lurking.
Breeze - skye, viper, cypher/killjoy, jett/Reyna, sova
Fracture - viper, astra, cypher, raze, skye - but it’s too early to tell
One thing I do wish to see with split is triple sentinel, so it would be like sage, cypher, killjoy, raze, astra.
Like imagine G2 using koldementa as cypher, mixwell with kJ, nukkue with sage, keloqs raze, and avova astra, damn that would be insane
FIY- these are based on my opinions, feel free give your own “best” comp