Ali on points. His speed and movement would be bigger factors than Klitschko's strength and size. Ali could take Foreman's punches past prime so he'll be able to handle Klitschko's power. Also, he'll be able to slip and dodge a lot of what Klitschko throws, jump in and land fairly often too. Nobody is going to sleep and it will come down to who lands the most which will be Ali. Size for size this will look a little like Holyfield vs Lewis but I'm guessing this fight is when both are in their primes and Ali was a speed demon, and Ali should have more success at 23 than a 37 year old Holyfield.
Ali never faced a man who stands flat footed,no head movement and who clinches/hugs/grabs/leans on his opponent who have no footwork as his defense and who only has a jab and straight right, and who was KO'd by 3 bums.
Ali has the speed to beat Wlad to the punch which would win him the fight. Wlad isn't really a good counter puncher, he doesn't make guys miss and then punish them as proven in the Haye fight, what he does is beat guys to the punch then either slip away out of range or clinch to smother any counter. This only works if you can beat a guy to the punch. Look at other jab and grab fighters like Ruiz, old Hopkins, Ottke they all struggled or lost to guys with faster hands who could get off first. Styles makes fights and Ali has the style to beat Wlad. Ali struggled with smaller, fast fighters with good left hooks, bigger fighters like Foreman, Terrell etc he usually had his way with. So Wlad simply does not have the style to beat him. If it's 12 rounds Ali wins a UD, over 15 rounds Ali stops him late, the extra 3 rounds would be too much for such a big super heavyweight with stamina issues to not gas badly.
Wlad isn't 25 pounds heavier than Foreman he is 25 pounds I used PEDS to bulk up. Wlad is more fit? Wlad tires far more quickly than Foreman does. Wlad is more skilled? Says who? Tommo? Wlad doesn't go to the body, can't cut off the ring but he is more skilled. Wlad has grade A china in his chin. If Ali could stop Foreman then he could stop Wlad. Maybe I was wrong about Tommo this clown just seems like a troll .
In fact Tommo gets put on ignored. He is actually worse than Marciano fans. Wait not that bad but it still gets put on ignored.
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Clay TKO. 76 onward might get outpointed, early 80's even subjected to a ref intervention. (this assumes the constancy of fully Kronk augmented Klitschko in all cases)