What are you planning on doing with your dog? Pet, rally, obedience, agility, field, or ???
I clicker train for some things and find that it makes the process faster and the dog more exuberant, whether for tricks, every day manners or exercises that you'd take into a competition venue. If you do it right, it's very precise which is also great for dogs that need to know they are doing things the right way. Instills a lot of confidence.
I'm personally a big Denise Fenzi fan. She is definitely a positive trainer, but technically, you can't be 100% positive. I mean, if you withhold a treat, that is negative, right? Her methods are science based and relationship with your dog is the first step toward success. Her methods are fun and positive and truly endorphine-producing, for both dog and handler. And, I like to know the why behind the method, and she always explains it. It's certainly changed my training philosophy and improved my dog's performance by 110%. It has definitely made me a better trainer. In fact, about a year ago I started over with everything using her methods and it's like I have a different dog. I've seen it in other dogs as well, not to mention in people. It's actually pretty emotional to see the changes sometimes.
There are a few others I like OK as they have some good ideas in certain areas, and maybe better videos or a better way to explain something, but I always go back to Denise. I trust her methods and I feel comfortable in knowing that she practices what she preaches. The other thing I like about Denise is that she has no ego and genuinely cares. She keeps a blog (free) and is active on social media, helping people through issues. She'll post her own mistakes and how she worked through them as well as helping out others. In workshops she'll help someone with something with a dog, and if it's not working, she'll say so and suggest other things to try, or she'll say, it's just your dog (typically with temperament issues) and you have to work around it. She does not claim to be a behaviorist. She's just a wonderful human being who has created a very caring and supportive community of dog trainers.