I think which leverage we select is not a matter. I always select the maximum leverage during sign up. I think most important is which lot size I am using . Obviously in margin trading lot size is related to leverage. But I don't think in that way. I just try to keep the margin as low as possible and free margin & margin level as high as possible. So if you maintain proper risk management it's not matter what leverage you have selected as you will choose lot size according to your trading account size.