Amateur with questions about flooring choices for 4 unit

[Mickey Brown]

So I bought a 4 unit in what i would consider a B class neighborhood. The units have badly installed cheap damaged linoleum floors. I'm looking to upgrade to a flooring option that will look nice, hold up over time, be easy to repair, and not break the bank. I plan on owning this building for at least 50 years.

I'm leaning towards luxury vinyl planks, since they seem to be the preferred choice of investors. However i have a friend who claims water gets underneath them easily and damages them, is this true? Also with the locking kind, what if i need to replace a piece in the middle because it was scratched up by furniture? Can i cut it out and put in a new piece, or do i have to unlock all of the pieces in the same row, until i reach the damaged one? 

Also I don't know anything about underlayment. I was thinking about installing a rubber underlayment in the upstairs units to reduce footstep noise.  (like this: https://www.rubberflooringinc.com/underlayment/2mm...). Is there any reason this kind of underlayment won't work with certain flooring choices, or are there better kinds of underlayment to choose from for noise reduction? 

[Peter B.]

I have installed quit a bit of lvp. Probably over 15k sqft. Have'nt had the moisture issue being trapped underneath as far as I know.

Sunlight warping. Have'nt had that either. Did however have it warp after a heat treatment for bedbugs..

As far as scratches..  It does scratch irregardless the grade or thickness. We advise all tenants to put pads on furniture legs to help prevent. We have this as a special provision in our leases..  When scratches occur I use a color match stain stick. I color in the scratch then wipe it down with a terry cloth. That works pretty well with the textured floors.

As far as being the miracle floor for rentals. I am not sure. It just hasn't been out long enough to determine that. Who knows how it holds up after turning a place 6-7 times?  No one on here knows.  But so far so good