In simplest terms...
Mono are more efficient than Poly panels... IE a Mono panel is about 5% more than a Poly panel.
For camping this usually doesn't matter all that much as all it means is that a Mono is slightly smaller.
Poly have a better temperature co-efficient... IE the hotter it is the less "more efficient" the Mono panels become and the Poly will take over.
For camping Poly is better
Solar panel performance is dollar related IE a top end panel of the same physical size and cells can be 20% more efficient than a cheapo.
This means a good Poly will easily outperform a cheap Mono or vice versa.
Solar panels degrade and the other main difference between manuf is by how much over time.
Most specs will be, say, "80% of output after 15 or 20 or 25 years" or whatever.
This means as the panels get older the performance gap between a cheapo and a high end panel will get better and better.
For a several thousand dollar house array this is quite important.
For Camping this doesn't matter all that much
To "top up" a 105 Amp AGM battery that is in a vehicle which is touring or for short term camping and only running a small Engel then an 80 to 100 Watt Array will be oodles.
I use a 100 watt array and that easily handles 2 fridges, LED lighting and electronics recharging into a 2 X 105 AH Full River AGM battery bank
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