Of those three, the crucial is the most reliable.
Of those three, the OCZ is likely the fastest.
That said, I wouldn't buy the OCZ for reliability concerns and I wouldn't buy the Crucial unless it was for a laptop that didn't need good speed because write access kinda licks. I rock the Samsung 830s in my laptop and the Intel 520 in my desktop - both are fantastic. Unfortunately, they're not inexpensive
This is an old post but I want to mention that I have been using a OCZ Vertex 3 for a few months and I have never been closer to crying and throwing a computer into a bathtub full of ACID more times than I have with this FREEZE Drive. The people on their forums give you a million solutions and updates for the Drive and guess what, it's all snakeoil. I cannot keep my PC case closed because I have to unplug the freaking drive at least 5 times a week. I hate it and I'm installing my OS onto a regular 7200 DEPENDABLE HDD later today because I'm so fed up. I won't invest in another SSD for at least 3 years. I thought it my just be OCZ but I've read too many SSD eff ups on so many forums to be coaxed into trying it again anytime soon. I can live with an extra few seconds/minutes/hours of combined load time a year from a HDD because it will be 1/100th of the time I'll spend trying to fix a SSD drive.