Klose is the far better player in comparison to trez.
As a certain Cruyff comented on Inzaghi's lack of footballing ability, im sure he would put trez in the same bracket....someone at the right place at the right time.
Klose has a great all round game, we all comment on his aerial prowess and finishing, but during the world cup he played good football, making clever runs, linking up play and generally being a good footballer, something strikers often lack.
If we had Klose up front with Dp, we would have much more entertaining football, and many more goals imho.
This is not to say trez is shit, far from it, but Klose is the better footballer....trez is simply the better goalscorer.