A former coworker has the first one you linked. All day on the dash, parked in sun, didn't add much charge to the bank, and actually got the batteries quite warm (Li-Ion doesn't like that)...

FYI - at 25AH (25000MAH) their claim of 1A current from the solar panel will take 25 hours of full direct sun to charge that battery bank.

Goal Zero, Yeti, Ascent, etc (all of the pre-packaged solar stuff) is generally very expensive for what you get.

The advantage? They are packaged into a slick setup, and ready to go, but expensive.

When I have a longer moment, I will make some suggestions for something cheaper/better if you're willing to DIY.