Here are two good value solar systems.
Renogy 60W Solar suitcase $235
Renogy 100W Solar Suitcase $279
I think the place to start when determining if/which solar system is the best for you is to start by determining your usage/load.
For example, do you have a single Group 24 battery with ~75 Amp Hour capacity and if so, how much of it do you use in a day?
Furnaces seem to be the biggest draw. Ours is a 2.3 Amp Hour furnace, many older ones are 4.7AH. Water Pumps pull a load. Lights pull a load. Etc. You need to figure out your load first..
Once you determine your load/usage you can figure out how much power you'll need to get your battery charged back up. A 60W may be enough or you may need a 100W or more.
If you get a good solar panel like Renogy/Zamp/Samlex you won't be as affected by partial shading since the solar cells are more efficient. If you get a cheap panel you'll be more affected by clouds and shade.
Flexible panels often have less cells (even though they're good, efficient cells) so they are more susceptible to partial shading as well.
The Renogy/Zamp/Samlex 60W panels will probably get around 4AH output. the 100W systems could get 5.5-6AH.
If you use 25 Amp Hours of electric overnight/during the day and you can get 3AH of charging you would need a little over 8 hours to top off your battery.
Everyone's load/usage is different but I would start by determining your load/usage first so you can put yourself into the right sized charging system.