Toto Drake II vs Drake

How does the flush compare with the regular Drake? I would prefer the 1.6 GPF drake, but prefer the Drake II looks. Whats the difference in quality? Thanks

TOTO Drake G-Max
CST744S elongated G-Max 1.6 gallon, 900 grams

TOTO EcoDrake
CST744EL ADA Watersense 1.28 gallon, 900 grams

TOTO Drake II
CST454CEFG Universal Height Watersense 1.28 gallon, 800 grams

Video of Ultramax II, which is the one piece version of the Drake II

[video=youtube;Xn9_zctMge0]http://www.youtube.com/watch?v=Xn9_zctMge0[/video]