4:1:1 vs. 4:2:0 on DV formats.: Which's better?

DV family has currently established as one of the two different compression families on the market in production and post-production for Standard Definition Television. DV use fixed bit-rate, 8 bit data, and, intra-frame coding techniques exclusively based on DCT Transform (Discrete Cosine Transform), VRL and Macroblock pre-shuffling prior to both two. There are two sampling structures coexisting in the market, 4:1:1 and 4:2:0. This document presents objective quantitative results from the emulation of DV-25 Mbs with both sampling solutions, the most significant aspects of DV algorithm and the behaviour of the codecs in response to VQEG 625@50 sequences. This article tries to tackle the problem of quality measures on DV-25 codecs, rather conditioned by the limited access to equipment and basically focused on qualitative analysis in previous works, providing more flexibility and quantitative comparisons.