I have tried quite a few different custard flavors, and there are some amazing options out there. But, for my money, if you are looking for a great Vanilla Custard, look no further than Banzai's True Collection.
As with most custard juices, there is very little TH, but don't let that stop you from vaping this great concoction. The subtle sweetness plays on your taste buds on the inhale and the creaminess on the exhale is just perfect. Very little eggy taste that you can get with some custards...and that is just fine in my book.
I usually vape this in the evening as an after-dinner treat, and although I would not use it as an ADV, I have from time to time and it is good as that as well...just too rich as an ADV for me, personally.
I found this at my B&M, but you can order online as well. Check out the whole collection in Banzai's True line...they have made some amazing juices here...