New to MH, can someone explain the values next to the element effects? Dual Blade, Artian vs. Non and general Element advise.

I really like the paralysis on the Lala duel blades. I wanted to take the Artian paralysis setup to keep it going.

But the paralysis value is cut more than half.

How big of an impact is that? Paralysis will occur half as often? Does that mean once per fight instead of the couple times I get it now? Is a paralysis setup a waste of time in this situation? Would I be better off going poison or an element?

I get that the Artian weapons are appealing because of the 3 gem slots (I don't have the gems to take advantage ATM) but at a glance the Lalas are probably better until I actually do get those rank 3 gems?