
Nothing says "I'm a serious Miqo'te" more than an eyepatch. Sadly, I think they are always on the left eye. Or at least the two models I saw during the Beta.
With that said, what I do when undecided about characters is make them all and try to roleplay them (this ussually means hunting around for fellow roleplayers). Backstory is not that important at this point, in case you are worried about that. Think of it as a 'test run'. The ensuing roleplay might even force you to come up with details about your characters you didn't even think. But, more importantly, it will grant you practical experience with them. Since you will be playing them a lot (or so I guess, anyway), it's quite important to try them both and decide based on this practical experience instead of the theory behind the character.
That's pretty much how I settled which one of my characters would be my main for roleplaying in ARR, really.
With that said, what I do when undecided about characters is make them all and try to roleplay them (this ussually means hunting around for fellow roleplayers). Backstory is not that important at this point, in case you are worried about that. Think of it as a 'test run'. The ensuing roleplay might even force you to come up with details about your characters you didn't even think. But, more importantly, it will grant you practical experience with them. Since you will be playing them a lot (or so I guess, anyway), it's quite important to try them both and decide based on this practical experience instead of the theory behind the character.
That's pretty much how I settled which one of my characters would be my main for roleplaying in ARR, really.