It's hard to get a fair response to your question. Many people have their personal favorites and many here have financial ties to a company.
And there isn't a single best boat. The designs are refined so much, that the differences are more a matter of personal taste. Some boats are better at a certain type of play, others will be better at a different type of play.
Now, if you are asking what is the easiest boat to learn to cartwheel in, that may be a better questions, but I still doubt you'll get fair answers here. I recommend going to one of the bigger kayak stores and ask the expert.
Also, a boat won't compensate for your lack of skill/strength.....