Everyone has different preferences but I prefer Capella flavorings for a couple of reasons. One is that they are all made to USP standards, mixed in a clean room not someone's house and go
through several days of QC before a batch is released for sale (which can result in a slower shipping). Second the flavors are more complex and consistent (% across the board is similar with every flavor) and easier for new DIYers to get great results even with a single flavoring. Check for coupon codes.
Congratulations and welcome to DIYing!!