hii!!
i think that realy depend on prupose of the model,if you gone to sand it and paint it allmost doensent matter!!
i use 0.06 for realy small prints (up to 2 cm), sometimes with 5 or 6 seconds betwen layer, depending on the model, and for regular prints, just like you i use 0.1, but for big prints i go for 0.2 or 0.25, faster or slower, once more depending on the model... but just because it would take to longer make a 18 cm print with layers of 0.1 or 0.06... 0.1 or 0.15 its a good print quality and with a good machine you will have some nice detailed prints