Slade's good, and would be a worthy opponent for Spidey, but I think Pete takes the majority, though not uninjured. With *real* prep-time (days/weeks of research and planning), the tide turns in Slade's favor, as I think he could orchestrate a situation that would shift things significantly.
Standardly: Spiderman, 6/10 (comparable speed with better agility; superior stength; spidersense; webbing)
With Slade having *real* prep: Deathstroke, 6/10 (fast/strong enough to be dangerous; gear; manipulation of situation/circumstances)
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slades meta-smashing equipment can do some damage here, catching Spider-man in the blast radius is the trick though. Id say a serious spider-man like KGB pete would win handily, marvels regular micky mouse pete would just scrape by.
KGB peter is far from simply a serous peter. There not really even remotely similar.
also 40 minutes prep is mnore thne enough time for deathstroke to put pete down, his staff a lone would be dangerous as hell for pete to face, let a lone his granades which damage superboy level people ect.
Yeah, with onesided prep and Pete's usual CIS I see Slade winning this. But if SM knows he's coming then its not gonna be easy and not every time if we're talking out of 10.
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Azula: My mommy didn't love me so I'm going to burn down your village.
I agree, it one of those things, if he gets hit he done fore, but he has the chance to evade, but it hard because slade has weapons not only capable of taking down some serous meta with prep, but also that have radius, combind with his own speed which is formiable, this is a tough battle for spidy.