For an AR, go taller, 1.5" for sure.
For a bolt gun... I'd lean towards 1.18"/1.35", but I'd wait to have it in your hands, depending on how the chassis fits you and how it adjusts one might be better versus the other.
The trend has been for guys to use higher mounts even on bolt guns, so a 1.5" might be just fine, but it depends on how the rig fits IMO.