I'll apologize in advance as I know this was covered somewhere at some point but a few different search's have left me feeling like I'm drinking from a fire hose.

So I know that at some point in the past, the Mod 12 LRP Savage Model 12 LRPV had a RH bolt with RH ejection. I also see that current production is RH bolt and LH ejection. However, I've seen pics of some models with a RH bolt and ports on both sides. My question is: What side does that style eject from?
Also, any advantage/disadvantage to any of these styles or is it all personal preference?
Thanks in advance for sharing your expertise!