Well, everyone's experiences will be different, so keep that in mind when trying different lubes out.
Personally, when it comes to flavor, I find System JO H2O Flavored to be the best (my favorite is banana). The downside is that it contains glycerin and parabens, which some people are sensitive to.
Sliquid Swirl is glycerin- and paraben-free, but it has a bit of an "artificial" taste to it - a bit plastic-like. But it's certainly not bad overall.