BAL type landing legs much less stable than scissor jacks?

When I got my new trailer, I wanted power leveling jacks, but the dealer actually steered me away from it because he said it wasn't as stable. They were designed the same way as the manual one shown above.

I haven't had the need for chocks as we typically only stay places for a couple days, but from what I've read and heard chocks can definitely help stabilize the trailer inside. May be try that before investing in upgrading or adding scissor jacks.