I'm planning to get the Density High procedure. What is the difference between the Classic Tip and the High Tip?

Hello. Lately, I have noticed a significant loss of facial elasticity and sagging in my cheeks, so I was looking into radiofrequency lifting procedures. I am writing this inquiry because I heard that Density High is very effective. I found that there are two types of tips, and since I am unsure which one would be a better fit for my skin condition, I am asking in advance.

Between the Density High Classic Tip, which emits only unipolar radio frequency, and the High Tip, which emits both currents simultaneously, which tip do you generally recommend for simultaneously improving sagging cheek elasticity and overall skin texture?

Also, assuming the treatment is done on the entire face, I would appreciate it if you could let me know the recommended number of shots for Density High to see noticeable before and after results without feeling like I'm wasting my money!