Does Polycrystalline vs. Monocrystalline really matter?

[thenunzzz]

I'm thinking about checking out this panels for my van: https://sfbay.craigslist.org/eby/mat/d/sacramento-overstock-solar-panels-for/7210644376.html
I would be using two, but they are polycrystalline and it seems like the recommendation everywhere is to go with mono. Does it really matter at this point?

 

[SolarQueen]

These days, it doesn't really matter except in extreme conditions. Get what is available.

 

[Solar_Mann]

Only time it matters to me is if size is a concern.