I've built and sold my own brand of tubular skylights, pretty much know about every tubular skylight brand on the market....
The only reason to get a regular skylight is the "view". You only get a view from a large skylight. Its better to install a tubular skylight than a 2x4 skylight.
Regular skylights need to be mounted on a curb, Preferably double pane to prevent condensation, and heat loss. Regular skylights will add a lot of heat, be careful not to overload your a/c with a large south facing skylight. To cut down on heat you need tinting or a window shade, that blocks part of the light you put in the skylight to get.
There is a big difference in light output between brands of tubular skylights. The "flexable shaft" model does not work very well! Avoid! The ones that use an elbow and mount close to the roof don't work well on North facing roofs. Avoid any using a plastic roof flashing.
The tubular skylights don't add heat.
