I had this same question as well, for a first "budget monofin" in the low price range, as a student my funds are a bit pressed. Anyways, after researching standard tier monofins, I have come across more positive reviews for the Advanced by Leaderfins than the Dolphin. The advanced is sturdier and has wing supports like the more elite models, which I assume helps greatly. Sadly it lacks the boosting angle of the flyer and hyper, and I wonder if it is worth the $100+ jump for a newbie like me to just go for the flyer instead. Confusion. 
