“The idea was that it took more accuracy to slice as you rode by than it did to simply present the point, and then let the forward momentum run the guy through and pull the blade out as you passed.”
The difficulty in pulling the blade out was why cavalry sabers were curved in the first place.
And it really doesn’t take a lot of skill to learn basic cuts.
Personally, I don’t have an opinion, since I’ve not used either method on horseback. I’m just relating what the argument was. Not much call for either technique these days.