Looking into lip augmentation: which is better a lip lift or fat transfer? Maybe both?

I'm not interested in fillers and dont want anything over the top I just want a little more volume in my top lip its a bit small compared to my bottom lip. For the fat transfer how soon can I come back for a second round if the first wasnt enough to get me to my goal and for the lip lift is someone with a longer philtrum a better candidate for that procedure? Thank you!