There are literally limitless possibilities of juices out there. Different flavors, flavor combinations, every vendors versions of the same juice will be different based on their base, different brands of flavor extracts, sweeteners, etc, etc. And all of these factors may change slightly from batch to batch.
Then there is steeping, flavors change as they steep. sometimes for the better, sometimes not. Whether it is better or not, is personal preference.
All these possibilities have not even factored in the most important factor of liking a juice. Personal preference. There is no way to account for personal preference other than trying a flavor and deciding if you like that flavor, from that vendor, at that stage in its steep cycle. Thats it. There is no secret to finding a juice you will like.
With that being said, here is my advice. Try to find a B&M near you that has samples of juice and try them all. Literally, try them all. The employees might not be thrilled with you, but who cares. Buy a couple you like so you can have an alternative to your vanillas for the time being.
Then read a bunch of threads here on ECF, and decide on a couple vendors you want to try. Order some sample packs. You will not like them all, you might not even like any, but you will start to narrow down the options of what you like. Then order some more sample packs. I wish there was a cheaper option, but again, there isn't. All the juice you don't like you can keep around for an emergency, try to sell/trade her on the forums, or give away to fellow vapors you know.
Come to us with more specifics, there is a lot of knowledge/experience here, and we can help you out. Need a recommendation for a NET, there are better shops for that. Fruits? Different vendors for that. Etc, etc.