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In my "OC Counter Assault Course", it was explained that the main noticeable difference in percentage is the amount of time it takes for "recovery" or the lasting effects. 2% effects wears off quicker than the 5%.
(Whether that is true or not, I have no idea... It's just what our instructor told us during the course. I have not done any independent verification since to me, it's really not a big deal or issue.)
A lot of officers around here tend to go for the 2% since that means less time the perp is going to be sniveling and snotting all over the back of their patrol car and less time listening to them whimper & whine on the way to jail.
The 5% solution is not any hotter or more incapacitating than the 2%. That is measured in Scoville Heat Units.
If pepper spray is going to work at all against an attacker (and there are a number of reasons why it works on some people and not on others) the 2% is just as good as 5% or 10%. All of them, if they do their job will allow someone enough time to escape an attack and find safety or transition to a higher level of force.
Personally, both my wife and I use the Fox Labs because they are the hottest on the market at 5.3 million SHU's
For me, 5.3 million SHU's has a better chance of having an effect on an intoxicated or drugged person than a 1 or 2 million SHU spray. I'd rather have a positive effect for a shorter amount of time than a chance at no effect at all.
Just my rationale, YMMV.
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-Bark'n
Semper Fi
"The gun is the great equalizer... For it is the gun, that allows the meek to repel the monsters; Whom are bigger, stronger and without conscience, will prey on those of us who without one, would surely perish." 
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