I tried both
Convertxtodvd and 1Click DivxToDVD, and my personal preference is 1Click DivxToDVD.
Convertxtodvd is a decent program that can convert more types of files but takes longer and there is quite a bit of quality loss compared to 1Click DivxToDVD.
As Tinylean mentions 1Click is very fast compared to other converters and there is almost no loss in quality as there is in
Convertxtodvd and others like AVItoDVD, TmpgEnc, or the older version of VSO DivxToDVD (now the new ConvertX). Also some, lesser known ones as well.
I will be purchasing 1Click DivxToDVD when I do my next conversion. I used it to convert VHS captures and compared the conversion against the other converters. There is a big quality difference.
So 1Click DivxToDVD has the best quality and the fastest conversion times, what more is needed??
BTW, this is just my own personal preference which I came to the conclusion for myself, everyone should test the free trials of the programs mentioned for themselves and decide for themselves. Cheers.