straight or 90 deg headers (pins) I just got an RFID module which I want to play with.
it came with two sets of headers (pins), both straight and 90 deg.
The pins are not soldered to the shield and I need to decide which and how to solder...

As they are not designated for any specific use (that implies packacging in a specific direction or other constraints) I was wandering if there are any consideration as to which one should I solder to the circuit? and in what orientation?


straight with long pins on the top of the RFID shield? (i.e.
solder the headers as if they where another component on the
shield?)   
straight with long pins below RFID shield?    
90 Deg on top of the shied pointing out / in of the shield   
90 Deg below the shied facing out / in of the shield


Which of these configurations I am least likely to regret :) ?
I usually use female headers pointing straight up off the board because they accept the most common double-male breadboard wires. The downside is that their mechanical connection to the board is not terribly stable due to the board-end pins being little bitty extensions of the sheet-metal socket inside the header. 

Male headers are much more stable, and a handful of male-female breadboard wires will connect them to a breadboard. The downside of going this route is it invites JRobert's Law of Erroneous Selection: whenever you have more than one kind of similar component, the first one you pick will always be the wrong kind.