COMPARISON OF THEIR FEATS:
They Both are Known to be using enhanced Haki of their time, ODA himself accepted that gold roger was known for his one of the best Conquerors Haki users. Meanwhile Ryuma the "Sword God" haven't much over revealed that much not providing us with total information about his feats but we still know that if the person uses to much Haki his feats are that He died at 47 age due to the cause of sickness while gold roger died at the age of 53 proving that Ryuma had used more haki in such advanced level even causing its blade to turn black while its proved that Roger had never done that. Ryuma Having better Armaments Haki with such high battle IQ that no one could enter WANO KINGDOM. This that Gold Roger is not stronger than SWORD GOD RYUMA.