VOO, SPYM, or FXAIX for Traditional IRA?

Hi everyone, Just wanted to really understand the key differences between these three ETFs that follow the S&P500. I know the expense ratios are slightly different from one another but not sure which one is best. Planning to do a lump sum with some old employer 401k rollover. I used Fidelity btw so that’s why FXAIX is also an option for me. Any advice/experiences would be greatly appreciated! Thanks!