They both have their pros and cons
Number one looks like it would be easier to clean due to it havng a dedicated section for mechanical cleaning and it also has the ability to hold more water and submerged media. But one downside is that because it holds more water you need to be more careful with the water level in it, you need to make sure that you leave enough room for the water that comes down from your tank.
Number two on the otherhand has alot of room for airated media which is highly efficient at remooving amonia and nitrite quickly, also having the room for a refugium is helpful as it allows for another means of nutrient exportation and in the event a fish is being picked on you have somewhere to put it so that it can recover. This depends on what fish you are keeping and the size of the refugium. Another benefit of this is that you dont have tobe so causious about the water level in the sump because in that design it will probably always be at or bellow half way.
On the contrary this design has less water in it and doesnt provide as much stability to the system.
Personaly i dont like to tell people that you should do this or you shouldn't do that. I would rather give people information that that it helps them to make a more informed decision by themselves so that they know what they chose is what they think is best for them.
Anyway i hope that this has helped you give you some insite into what you would like to do with your sump.
Good Luck
Thomas