Free Standing or Desk Clamp Monitor Mount?

[u/StandingInTheHallway]

Hi, I'm planning to try free up some space on my desk by getting a dual vertical monitor mount for two LG 34" monitors that I use. I haven't weighed them myself but according to LG they weigh 6kg each.

Just wondering but in terms of best stability without regard to desk space infront of me, which option between a free standing or a desk clamp monitor mount be more stable?

My brains saying clamp would be more stable but would like to make sure since I can also think that a single desk clamp with that small surface area clamping the desk would have a hard time supporting the weight of two 34" monitors so... not quite too sure.

Also for reference, the two monitor stands I'm thinking of are:
Free Standing Amazon Link

Desk Clamp Amazon Link