Alrska 180W Solar Panel Made of advanced encapsulation materials with multi-layer lamination to protect cells from physical damage or deformation and improve cell performance
Alrska 200-watt solar panels use shingling technology for higher power generation efficiency.
Yes, every panel includes bypass diodes, they are in the junction box.
If you are only charging a only solar generator, then a single 200W would be more efficient because of the lack of a parallel connection between two 100W panels. However, if you were trying to charge a 24V battery bank, then having two 100W in series, would work; a single 200W would not be able to charge a 24V bank.