Cloud's strenght/durability/speed are significantly higher than Ryu's, he has this
Take a look at the following feats:
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7:12-7-23
Cloud bifurcates part of the Omega Weapon with what appears to be a single slash with one sword.
To understand this feat, you must first understand the durability of one of these weapons:
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Here the Sapphire Weapon is hit directly by a shot from the unamped Mako Cannon and is unscathed. Rufus and Heideggar even comment on how that is possible since they hit It dead on.
Now, the Weapon cut by Cloud was the Ultimate Weapon, known as Omega. Which can be scaled with Sapphire since all Weapons are mako constructs, and good chances are Omega is a bit more durable, since It's, well the Ultimate. Now on to the force of a shot from the Mako Cannon:
YouTube video
This video explicits that AVALANCHE was going to use the Cannon to destroy the city of Midgat Itself. Confirmed by the narrator and multiple characters.
Conclusion: Cloud has City-level strikes when not-limit breaking with one sword. That is quite abover Ryu in strenght.
As for Clouds's durability:
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2:25 Cloud is thrown into Bahamut Sin's Tremor Flare, whcih he even disperses and comes out unscathed.
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8:58
The result of that massive energy release? Here:
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Remember, that hole led to the planet's core.
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Afterthought:
I think Cloud has significant advantages in strenght and durability. One could say magic is around the same. I'll get back to this on speed when I can.