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-Both have bipods
-the sights on the 550 are better in my mind
-they can both take high and low mounts
-barrel length is close
-the 550 has a newer gearbox but has had some issues with the burst chip
-the SG1 takes a large battery but the 550 has a collapseable stock
-mags for the 550 are easier to find and cheaper if you buy MAG mags
-the 550 definatly has more cool features like the swinging trigger gaurd and burst chip but the SG1 is proven pretty well to be a great gun.
I would go 550 if they came with a full stock. I have owned both for a short time and I like the SG1 better for the reasons above but it is a close race still.
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