Well, keep in mind that in a fight where one is naturally invisible, that is typically taken out for a fan fight to even the field.
I'll list some pros and cons for each character
-Immense spiritual pressure
-Can stand on air, effectively allowing him to "fly"
-Far faster than the eye can see with his "Shunpo."
-Flexible with his Getsuga Tenshou to make it both a long range and short range attack
-Incredibly skilled swordsman
-Vizard powers increases his power by several times
-Can tap into vast amounts of power when he is weakened
-Can fly with the aid of his cursed seal
-Incredibly skilled swordsman/hand-to-hand fighter
-A vast array of abilities, many of which are long range
-Chidori is a highly flexible technique that costs the roughly same amount for each variation
-Cursed Seal Lvl. 2 power increases his abilities by several times
-Is generally very talented and intelligent for his age
-Generally inexperienced and is constantly caught unawares
-Getsuga Tenshou is the only attack other than mundane slashes that he actually has
-Usually unable to tap into his full powers until he is severely injured
-Cursed Seal doesn't exactly grant power, but forces him to use more, causing him to expend far more energy than he typically should for some attacks.
-Chidori is a very high cost attack
-Risks death if runs out of chakra
Based on this, it's difficult to come up with a completely legitimate answer as some of these guidelines are retconned in some way or another based on story, so we don't know the true tale.
But though I generally favor the Naruto universe more, I will have to side with Bleach's champion this time around. If you ask me, the win will go to Ichigo due to his ability to tap into vast amounts of power when things look rough, and for Sasuke's Cursed Seal taking too much of a toll on his body.