I am not too familiar with this brand but this appears to be the same car. If it is not, I will feel rather silly!
How do these two makes compare to one another? Assuming they are the same with one being an updated model over the other, which performs better for the money?
Overall, the biggest difference is the engine. The 308 has a turbocharged 2.0-litre diesel engine whereas the 208 is stocked with A 1.2-litre turbo petrol three-cylinder. The 308 is substantially louder and more powerful, as one would expect.
If you want a breakdown that goes into more detail than I possibly could, you can look at this page: