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selection of opamps depend on ur application..
some applications such as BGR require ur opamp to have high gain...
some applications require higher slew rates and faster switching times.....
so the main parameters can be.
First you must understand the kind of electronic system you want to design, ans that will define the king of op-amp. Because there are so many kind of opamps you can consult the classification of op -amp the first of them:
The first one is the most common and there are so many kinds of the: general purpouse, high speed, high SR, precision, low power, etc.
Op-Amp parameters fall into 2 categories:
DC parameters (Affect errors regardless of frequency)
Input Offset Voltage
Input Offset Current
Input Bias Current
Common mode rejection Ratio (CMRR)
Power Supply Rejection Ratio
Differential Input Voltage Range
Common Mode Input Voltage Range
AC Parameters (Affect errors at high frequencies)
The opamp selection depends upon ur applicaation.
whether u r using it for dc operation r transient operation,
for dc operation the gain should be high and for transient applications the speed wil be the main criteria so u need to focus on bandwidth of opamp.
hope this helps.