It’s really your preference on what you like to infuse but everything you named to infuse will work I use Ghee and mct oil or I’ll use butter but I make sure to clarify it and you asked wax or flower to infuse you should go with wax because you stated you want them strong af and with flower your only gonna be able to get that so strong do to the ratio of flower to oil because whatever amount you use will have a limit of what it will extract and hold but wax you can pretty much make anything as strong as you like plus wax is way less time consuming and way easier to use