I would go for the Armotec 70 the head shape is very bad I would think the arcsaber 7 will be good for you
well the 4U stands for the weight so 3U is heavier then 4U so the higher the lighter the racket is G4 is the smaller the number the larger the handle is
i have explained but oh well for "G" the smaller the number the larger the handle and for "U" the smaller the number the heavier the racket is
AT70 MG* * = MEGA Frame Due to its unique large-frame design, the Mega-Frame further enlarges the already large sweetspot provided by the YONEX Isometric Square Head Shape. Compared with an ordinary racquet, the Mega Frame provides a 34% larger sweetspot for more reach and more effective off-centre hits.