Sif vs Big Barda
Powers: Sif possesses the conventional attributes of an Asgardian women ("goddess"😉. Like all Asgardians, she is extremely long-lived (although not immortal like the Olympians), superhumanly strong (the average Asgardian female can lift about 25 tons; Sif can lift 30 tons) immune to all diseases, and resistant to conventional injury. (Asgardian flesh and bone is about 3 times as dense as similar human tissue, contributing to all Asgardians' superhuman strength and weight.) Sif's Asgardian metabolism gives her far greater than human endurance during all physical activities. Sif has extensive training in unarmed combat as well as swordsmanship. Her natural fighting ability is only surpassed among Asgardian women by Brunnhilda the Valkyrie.
Personal Weaponry: Sif wields a special sword enchanted by Odin to enable her to "cleave" passageways between dimensions (primarily Asgard and Earth) by a special pattern of swinging motions
VS
Super Strength: Barda's super strength comes from her heritage as a member of New Genesis, where all of the people of that realm are genetically superior to normal humans in their physical characteristics. She was later augmented by Darkseid to further increase her strength and stamina twenty-fold. Barda's strength is nearly on the order of Wonder Woman's lifting weights weighing nearly fifty tons.Endurance/Stamina: Barda's superhuman endurance has been trained by being a dog soldier of Apokolips and later the leader of the Female Furies. Barda's physiology allows her to process her biological wastes more efficently and as such can function at her peak efficiency for a much longer time than a normal human. With her advanced combat training, she is superior to even members of the New Gods who have not received such training.
Weapons and Tools:The Mega-Rod: Barda's signature weapon, no other has ever been seen. Its origin is unknown, and its powers are vast and numerous. It's primary ability is to project energy (of an unknown nature and origin) against whatever Barda hits with the Mega-Rod. The amount of damage able to be done has been sufficient to demolish an entire building.