question re: vinyl plank

[Erin K.]

I have used vinyl plank flooring in a side by side duplex we rehabbed a while back and liked it.  Now, I am renovating an upstairs unit, replacing the current carpet.  Will the vinyl plank be noisy for the downstairs tenant?  We are planning to use the floating floor snap-together planks if it matters. 

Second related question: I noticed the glue together vinyl plank is a lot less expensive. Does anyone have a strong opinion about whether the extra cost is worth going with the snap-together type?  Easier to install or harder?  

Thanks for thoughts!