Their are realy only two bombers worth serious consideration for Italy, both saw service throught the war with Italy, and with the exception of the BoB both saw service in every theater Italy faught in( I am not 100% shure the SM 79 was in Russia though).
Now If we look at the capabalities of the two we soon see the following, The Cant Z 1007 was:
Faster: Top speed aprox 10 to 30 mph faster than the SM 79(depending on model)
Climb Rate: Cant Z 1007 climber initialy aprox 500 ft per minute faster than the SM 79.
Z 1007 initial climb rate aprox.1, 550 ft/min.
SM 79 initial climb rate:1,150ft/min(typical)
Range: The Cant Z 1007 had aprox. twice the range as the SM 79. SM 79 aprox 1,243 miles Cant Z 1007 aprox. 3,100 miles.
Defensive Arament:Both had a very simmilar defensive package, two 12.7mm and two 7.7mm guns, the 12.7mm being dorsal and ventral guns and the 7.7mm beams guns. The SM 79 howeaver on some models had a 12.7mm fixed firing ahead.
Bomb load, the Cant Z 1007 could cary a larger bombload.
SM 79 aprox2,640 pounds(later models) or Two 450mm torpedos.
Cant Z 1007 aprox. 4,410 pounds internaly, alternatively two 1,000 pound torpedos and 4 bombs up to 551lb on under wing racks.
So in conclushion the Cant Z 1007 is Faster,Climbs Faster, Has Twice the range, and Twice the Bomb Load and is as well defended, also In torpedo mode it not only has the same torpload but can cary Four 500 pound bombs at the same time.
Cant Z 1007: