Hi guys, I'm doing research about technology adoption and i wanna ask about sample in my research. Should i use sample users that have used the innovation before or should i use sample users that havent used the innovation? Or should i go both of them ? :/

I've read some of journals, and many of them use sample user that have used the innovation but there is a few of them that use both of them. Maybe some references can be a help for me, thanks.