There is an insanely wide variety of RDA and RTA choices available, and new devices hit the market at a rate of several per week. Some are built to maximize flavor, others for big clouds, some strike a balance between the two. You'll have to do your own research on the forums to see what appeals to you, as simply asking this question is likely to net a slew of answers wherein members tell you what they've experienced and liked, but very few of us have experience with enough different devices to speak with authority on others with which we're not familiar. Those that do have that experience are probably posting reviews to help you with your research, rather than waiting for you to post a thread asking them to deliver a dissertation on the 100 devices they're personally familiar with.
More helpful: do some research, and if you narrow your search down to 2 or 3 devices, that's the time to start a thread asking for specific comparisons between them. You'll still get a lot of posts from people that either ignore your question or are such fanboys of their favorite devices that they'll try to tell you that you need to buy whatever they have because if they bought something it must be the best, but having some idea of what you want before posting will help reduce these usually-unhelpful comments, or at least limit them to suggestions that closely align with what you want if you've worded your desires clearly.