Hi Stuman,
First, since you are interested in programming in VB.NET, you will have to use the NI-DAQmx driver. Next, the 6070E can be programmed using both drivers, but the software is limited to programming with only DAQmx. The latest version of the driver is 7.3, and can be found
here. Please note that version 7.4 is going to be coming out shortly. Nonetheless, 7.3 will do a great job.
Now, to explain the differences between the drivers, Traditional is the older of the two drivers. Traditional was the original DAQ driver, and has been updated by DAQmx. DAQmx came out with the advent of express vi's in LabVIEW 7.0. DAQmx is a much better driver, and is much easier to use. There is one set of functions for all of the different tasks (AI, AO, DIO, etc.) with DAQmx. Traditional had specific VIs for AI, AO, DIO, etc. It is a great idea to program with DAQmx, especially if you are just beginning.
I hope this clears up your confusion.
George