To point out the obvious - one is wide angle, the other is a telephoto.

Look at the work you've been doing and also think about the type of shooting that you'd lke to be doing. The answer as to which comes next should become obvious.

Michael

I'm currently a second year part time student, and I'm looking to up grade my 645 kit. I would like to add the 35mm 3.5 T Distagon, and the 210mm 4 T Sonnar. I concentrate mostly on nature/city landscape, and some portaiture.
 If anyone has any experiences with these optics any comments would be appreciated.