brest feed or formula

currently I'm breastfeeding and supplementing my daughter with formula when needed. Im pretty sure I have an adequate milk supply but she's not latching well enough to empty my breast fully.. its like she's starts of REALLLY well and gets too lazy so sometime I need to top her up or some days she would feed all day.. I'm not sure if I should just completely switch but I'm torn be used she uses me for comfort as well and won't really take a paci..

so I guess my question is.. would you continue to try breast feeding and supplementing or just completely switch to formula.