Hmmmm. I have limited experience because I am pretty new to vaping. However, I am slightly obsessive, so I have spent a ton of money already on products and juices. Both my husband and I were pleasantly surprised to find at least one all day vape on our first large order with a vendor. Granted, I ordered 30 flavors. Without a doubt, Mom and Pop Vapor Shop's Pchela's Famous Five Layer ejuice has become the #1 choice in our home. My husband goes through this stuff by the 60ml bottle full now. I order at least 3 bottles at a time. This is even after I have ordered another 50 + flavors from other vendors. I also like their Pchela's Poison, Peach (very good peach flavor), and Grasshopper. I am not a huge fan of mint flavors because they remind me of toothpaste, but I like to have a minty one around for when I have a head cold. ;-)
I have also been very impressed with Altcig and Kick Bass Vapors flavors. I can't comment on many of them specifically because I haven't tried a lot of them yet. I have yet to try one that I haven't liked.
I ordered samples from Alice in Vapeland. Their Black and White Cookie was a huge surprise in tastiness. The other flavors were good, but too subtle for my weak tastebuds. I have placed another order with them for 3 flavors, and asked for strong flavoring. We shall see.
Next on my list to order from is Vape Dude's. I hear a lot of good things about their juice.
I will have to say that most of my motivation in ordering from vendors is their discount codes. Altcig had a 30% off code when I ordered. Kick Bass Vapor had a 20% sale when I ordered. Alice in Vapeland had a 20% off sale. And Vapedude's gives a whopping 40% off first time orders. Gotta make those dollars streeeeeetch.