Basing my judgement solely on techniques and not at all on powers, it would be a tie.
The Hadouken and Dark Hadou are similar to the Kikou Ha.
The Messatsu no Hadou and Shinkuu Hadouken (versus series forms) are comparable to the Kame Hame Ha, Galiku Hou, and Final Flash.
Messatsu no Zankuu (versus series form) is comparable to the Renzoku Kikou Ha attack.
The Shinkuu Tatsumaki Senpukyaku (somewhat) and the Shippu Jinraisu (sp) are very similar to Goku's Abesergi Kick (named only in games, performed on Perfect Cell in the Cell games).
Akuma, Evil Ryu, and Evil Sakura's teleportation move (God I feel dumb for forgetting the name) is comporable to Goku and King Kai's Shunkan Idou (that's Instant Transmission for you dubbies).
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On another note, TarkanX is correct that no DBZ character has the capacity for speeds at or beyond the speed of light, necessarily. The anime is not accurate in showing the increase in speed and strength, or these long, grueling 20-minute segments of fighting would start to be crammed into perhaps 30 seconds, judging by my calculations (I have no life, I admit it) of how much faster they should have become, and how fast the anime shows them moving. The manga allows you to use your imagination, eliminating this slow-mo play-by-play on TV.
Another factor is that if their speeds are indeed approaching the speed of light, Einsteins theory of relativity (that space and time are intertwined) comes into play. The fighters would experience a slowdown of time in comparison to the rest of the world, but they would see the rest of the world as moving VERY quickly. In effect, the two fighters would travel forwards in time in perspective to the crowd of watching people, making their movements APPEAR to be faster than the speed of light, when in reality by the fighters' perspective they are not travelling that fast.
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Anybody who can understand what I said care to debate my points
?