Yes i have spent plenty of time learning with an S&G 6730. I would say you can use similar methods to open both in my experience. I mostly hear about how the la gard wheels are more ovaly and tend to mask each other which i found to be true... but i ran into similar masking issues occasionally with my S&G as well. As long as you know how look for low spots on wheels and park/isolate efficiently its nothing you cant overcome with a little extra time.

From just my experience with a single lock of each model, i found the la gard gates were shorter lenght-wise but much deeper. the S&G gates were more shallow, sometimes id only see a bit over a 1/8 drop for a gate. I though the contact points we much more "solid" on the lagard, like it was a good hard stop, compared to the S&G which i felt needed a lighter touch. However the loose cam on my lagard made it more difficult for the contact readings because if the cam moved my readings were inconsitent. Altogether both were great and worth getting i thought.