thnaks for the replies - it confirms my impression that it is easier to make steady but not spectacular money on OH-H/L. I see players on O/high making lots of money fast - but I am never sure if they are having a lucky streak or are very good.

Looking at my stats more carefully I see that my winning sessions are not too different for both (about 60%). It is just when I lose big it tends to be in O/high, cancelling out a lot of small wins