The 741 is obsolete... almost nobody uses it anymore. In terms of a jellybean opamp, I would guess that the LM358 and friends (LM321, LM324, and modernized rail

The 741 is obsolete... almost nobody uses it anymore. In terms of a jellybean opamp, I would guess that the LM358 and friends (LM321, LM324, and modernized rail-to-rail CMOS descendants) are quite a bit more popular. The bipolar LM358 family is also pretty much obsolete by modern standards (plenty of nicer rail-to-rail amps available), but you can't beat them on price since they've been second sourced by practically every analog company in the industry.