LP is important for scoring for guards in all offenses not just Fastbreak.
If I had to rank them (which I don't but I am going to do anyway) I would put them in order of usefulness as:
1. Fastbreak- The scoring equation for FB uses ATH/SPD more so you can get away with lower LP and BH. You can get away with LP's in the 20's at D3 if the ATH is 70+. Ball handling as low as the 40's is also acceptable.
2. Triangle- I love having one guard being a SPD/PER scorer and the other being a ATH/LP scorer. Triangle uses SPD and ATH a little less than the other offenses so a higher LP (35+ at D3) is better.
This guy should be a stud pretty soon:
https://www.whatifsports.com/hd/PlayerProfile/Ratings.aspx?tid=13687&pid=3444993
60 ATH, 70 LP, 90 BH B+/A- FT
3. Motion- Can utilize the marginal scorers with lower stats like FB but requires a higher PASS rating than the FB.
4. Flex- Probably the worst offense for the ATH/LP because it weighs SPD/PER more but if you have high #'s like in the triangle can still be an effective scorer.