Eggbeater pedals are notorious for breaking. I bought a bike that came with Eggbeater Candy C pedals and the pedal spindle broke in less than 1000 miles.
I investigated on the Internet and I'm not the only one.

The M520 has been my main pedal for years and years. A great pedal.

I have have some A530s but they are not as nice to use. I only ride clipless. The A530s are kinda' bulky and it's easier to hit you leg on them.
The M520s are not bad to ride with non-SPD shoes if you're not going far.