Sounds like you have installed DVD2SVCD ver 1.2.2 b1 (the latest) and your right it doesnt mention avisynth 2.52 (actually installs 2.54) but does about D2SRoBa. Install it. I have not updated the DivX to DVDR Tute as the author of DVD2SVCD was about to post a new version that handles AC3 with avi/divx conversions. This would make it the perfect converter, however, the new version has not eventualted yet. Give it some more time. To use the D2VRoBa option, have a read of the DVD to DVDR Tutorial as its oriented around the D2VRoBa option now for quicker & better conversions.
As for Nero, it simply works 100% of the time without fail, why would I recomend anything else. You can of course use whatever you find best suits you as you may not have a "free"opy that came with your burner or find it to expensive. Another alternative is to get DVD2SVCD to make an ISO file, then burn that out with DVD Decrypter. That would be my second choice of burning.