The 10x42 IOR has been around for a long time and is generally a robust design (stay away from their 10x56, though).
Optically, the IOR is a touch better than the SSHD 10x42, but it is close.
I prefer the turrets on the SSHD, though. Better feel and probably more robust.
However, the IOR has turret covers, which a lot of people like.
Personally, I use the SSHD with Mil-Quad reticle and like it a lot. It sits on my LR-308 paired with a miniature red dot on a 45deg ring in a "poor man's" 1x/10x mount.
It works great and has been just about bulletproof in my experience.
Since rear parallax is ambidextrous, I hae learned to really appreciate it when I shoot left-handed.