Does anyone know what's the difference between Head Radical Microgel and Youtek version?
Hype, that’s what it is.
The predominant material used in rackets is still graphite fibers and the matrix that binds them together. Every year or so, manufacturers come up with some new tech to sell rackets. If the material is so good, why change it like yesterday's underwear? How much more feel, power or control does one really need from a racket? The reality is that specs must be maintained to preserve the performance characteristics of a racket line, regardless of what technojunk they mix into the frame.
Personally, I don’t get carried away with microgels, youteks, basalt n-coded x-factor liquidmetals. Beyond the hype, the static and dynamic racket specs pretty much tell the real story.