The best thing about the Ti is the overall colour.
The best thing about the RG Schumi is the different blend of subtle colours in the dial. The dial in the Ti looks plain compared to the RG Schumi. However the worst thing about the RG Schumi is the gold case. I just don't dig gold watches. Having said that the overall design here (and in the LBJ) compensates for the gold case.
The reason I ordered the Platinum Schumi is to try and get the best of the above. The blue Schumi has a less mono colour dial and it doesn't have the gold case. However it has a blue strap although this can easily be swapped for the plenty of spare grey XS straps we all have.
Looking at pics though I still think the Ti Schumi will win overall as the best Schumi and will reign as my daily beater. Interesting to read though that the two people on here who already have all three Schumis both vote the blue/platinum Schumi as the best.