Just another few notes - a lot of vendors (I know Heathers Heavenly Vapes and Pink Spot in particular, but several others too I'm sure) will add extra sweetener if you ask for it in the comments section of your order even though they don't specifically mention it otherwise.
Another sweet juice I loved was "A Hint of Strawberry Cheesecake" in double flavor from Gourmet Vapor. Even the car smelled like strawberry cheesecake when I vaped it while driving. You have to be careful with Gourmet Vapor though because they let customers create their own flavor formulas, which doesn't always end up well (LOL), so you never know if what you're ordering there is a "tested and approved" recipe by the vendor or a customer's mistake. I ordered lots of flavors in samplers from them and this one is the only one that I really liked (and vaped up the whole bottle in no time). Well, I like the chocolate raspberry too (perfect balance of one to the other) but it wasn't particularly sweet per se.
I did not have much luck with Ms. T's Bakery, though I've seen others like this vendor. To me, the banana flavor I ordered, although VERY sweet, was just perfumy and chemically, even after sitting for months. However, some of her other flavors might be good and she has lots of sweets. You can't judge a vendor by just one or two juices (even my favorite thus far has one I ordered which gets rave reviews but I can't stand).
Finally, another flavor I haven't tried on its own, at least yet, but works great to sweeten & smooth some others that I haven't liked so much (like a strong bitter coffee and another bakery juice that was just a bit perfumy) is French Vanilla (extra flavor requested in comments) by Pink Spot Vapors. It works so well to fix the juices I've mixed it with that I figure it MUST be extremely sweet & smooth on its own based on the way it's changed & improved the others.