If you're buying for oral and nothing else: pick on flavor, not formula. Everything here is water based and body-safe, so the only real decision left is dessert, fruit or cocktail.
If you're prone to yeast infections: check the panel for sugar and glycerin. It is the one ingredient question that actually matters in this category, and it is why the sweetest-tasting lubes on the market are not here.
If you cannot pick a flavor: buy the 2 oz size. Most of these come in a small bottle that is a few sessions rather than a commitment, which is a cheaper way to find your flavor than guessing at a 4 oz.
If toys are involved: you're already fine. Every flavored lube here is water based, which is safe with every toy material we sell, silicone included.
If artificial fruit tastes soapy to you: go dessert instead. Salted caramel, vanilla and butterscotch tend to land better than fruit for people who find candy flavoring off-putting. Reactions are split and both camps are real.
If you want it to last: switch to unflavored for the main event. Flavored formulas are thinner and absorb faster. A plain water based lube holds up longer once oral is over.