With lower dose pills you are less likely to experience side-effects such as tender breasts, water retention (bloating), and perhaps moodiness and weight gain. However, none of these may occur.
Also, you are more likely to have spotting or breakthrough bleeding on lower dose pills than higher dose pills.
Keep in mind that side-effects differ from woman to woman, you may experience different problems with different ones that may or may not relate to the amount of oestrogen. Its a bit of a trial-and-error to find the most suited to you.
Hope that helped.