Here is the advice I gave someone looking for a yo-yo for his 6 year old daughter. Sort of goes along with this:
In the end it all depends on the age and the comfort level. I find younger kids WANT to learn how to make it go up and down so a responsive yo-yo is a perfect fit. Quite a few of my students call the yo-yo in my classroom a cheater yo-yo because of the bearing and it is metal. 
I have shown a couple Jensen and Haponik videos in my class and get quite a few staring in amazement.