i'm currently wearing a sewn in weave. my hair is loose in the front, sides and most of the top. i have the back in cornrows and the tracks sewn in. i do it myself every week.
i was using straight hair when i had it professionally done, but found it to require too much maintenance. i'm using wavy and sometimes curly hair now. i'm really happy with the curly/wavy look. imo, it looks more natural.
also, i did not want to use daily heat on my hair in order to blend it in. i have 4a/b relaxed hair. it requires me to use heat to straighten it if i want it as straight as a straight weave. with the wavy hear, i can wash and go. i slick it back with gel and i keep it moist with water and glycerin. i also spray the tracks with my water/glycerin and lavender oil combo daily. this keeps my hair from drying out under the weave. so far, it's working better than any other moisturizer that i've tried.