Use 2.0x or 2.5x for TMPGEnc?

[ookzDVD]

I usually use avisynth 2.07 to make VCD use TMPGEnc,
with avisynth 2.51, I have to add the ConvertToRGB24()
at the last script to make it work with TMPGEnc.

So my question is which one should I choose to get the better result,
the one with the old avisynth 2.07 or the one with the latest avisynth 2.51 ?

Thank you.

[Wilbert]

If your source is not YV12 it doesn't matter anything. If your source is YV12 (DVD) then you get slightly better results with v2.51 (see v2.5 faq for more info).

[ookzDVD]

All my sources are DVD.

So.. better I use AviSynth 2.5x,
Thank you.