Kenin's not been relevant recently enough for me to have a strong opinion about it.
Jabeur's is very good, but she overuses it - that's how Rybakina beat her at Wimbledon, by clocking the dropshot Jabeur went to so often.
Sabalenka's isn't a great shot, but it's effective and she gets away with it often because of how deep she forces opponents, and she's judicious with it.
Vekic's is ugly and obvious, but often effective for similar reasons to Sabalenka, but she goes to it too often, especially when she's flagging, and it can turn into a bail out shot.
Vondrousova's is excellent, especially on clay, but she occasionally overuses it, especially on hard courts.
Putintseva is perhaps as good as Vondrousova's from a technical POV, and she's far more judicious, so I'm going with her.