9mm AR Input.........

Damn it, you guys are making a 9mm really tempting. I can't shake the 10.5" out of my mind.. I have a 14.5" Stag coming really soon.

For the guys that have both: should I get a 10.5" in 5.56mm or 9mm? Is a 10.5" 5.56mm too similar to the 14.5" ? Should I get a 9mm to have something different (and much cheaper to shoot) ?
 
I have 9mm lower parts coming in soon...
For me, it's gonna be the RRA 10.5" 9mm A4 upper, that's for sure.
But I'm hesitating as to which lower to purchase; Stag, Eagle Arms, RRA,... Has anybody got experience plugging a 9mm RRA upper to a lower from a different manufacturer ? any issues ?
 
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