Falling prey to analysis paralysis
You practically need to be a CFP or tax professional to get your head around the maze of rules governing the various IRA types: Income limits and tax treatment of contributions and withdrawals vary significantly.
But don't let the fear of selecting the wrong IRA wrapper keep you from making any decision at all. If you make an IRA contribution that later proves ill-advised (for example, you funded a Roth IRA when you earned to much to contribute to one), you have a valuable escape hatch called recharacterization, which is essentially a do-over for IRA investors.
Recharacterization doesn't enable you to undo an IRA simply because your investment choices were off the mark, but it does enable you to switch to the IRA wrapper you should have chosen in the first place — Roth instead of traditional or vice versa.