For several reasons, including that you will handle much greater load with the back squat than the front, it is vital to do much more back squatting for olympic lifters. Back squats do have a greater affect on the posterior chain and help you learn proper low squatting position (whether for squatting or cleaning). Front squats will invariably force lifters to be towards the front of the feet at the bottom of the squat while back squats allow you to be back into the feet more. Back squats will teach lifters to squeeze with the glutes to start up and that is key to getting out of good squat cleans. Front squats often teach lifters to get up with their quads (often making them shift forward to rise) and not think about their glutes. This will not lead to solid bottom positions or correct recovery from squat cleans with higher percentage weight. Glutes first, quads second is a better way to think of rising.
Also, those who front squat much more than back tend to go to their forefeet earlier when driving the Jerk. (Quads work best when the balance is on the forefeet.) Back squatters will have the musculature in the rear to sit down on the heels during the dip portion of the Jerk and drive up through the rearfeet longer on the drive phase, which is proper.
Compared to deadlifts for posterior chain development, back squats are better because of almost equal 1RM, if you have trained correctly, and the fact that you can work with good percentages of squatting weights many more times per month than you can with deadlifts. Heavy deadlifts, because of bar distance from the average human COM and the fact that it is places at the end of smaller, weaker musculature and cause the back position of the lifter to be more angled than squats, cause much more stress on the body. In my opinion, deads shouldn't be done more than once every two weeks or so and only through part (~1/2 or a bit more) of the training year for olympic lifters. They are, however, critical for full development.
You will hear a thousand different opinions about squatting. Mine is that you back squat much more than front if you are squatting for olympic lifting.