My favorite so far is Backwoods Brew Vanilla Bean for an all-day vape. It's not a strong, creamy or particularly sweet vanilla though in a way it reminds me a bit of cream soda, but in a fainter less sweet way? Has some TH. Works for me all day.
My other favorite (and totally different) is Velvet Vapors Vanilla Almond
tobacco in their Velvet Blend but they expect to be closed all month due to a family emergency. This
juice doesn't taste like tobacco to me. It tastes like a sweet incredibly smooth rich vanilla with a hint of almond and some moderate TH. I adore it.
Some ejuices I like with vanilla and more prominent other flavors are FreedomSmokeUSA's oRYental 4 (their sweet RY4 which has more caramel taste than vanilla) and sometimes I like Madvapes Chocolate Fudge Bavarian Cream (once it steeped a bit - was a bit flowery to start with) which includes a taste more like vanilla whipped cream.
And I am looking for more vanillas too.