I have set up a test with some samples from TMPGEnc, CCE and Mainconcept Encoder. I've uploaded them to a website so you can decide yourself which one you like best.
Code:
Presets: Mpeg2, Bitrate with average bitrate @1000, min bitrate 300, max bitrate 5000, "Notch Matrix" KDVD, filesize: ~2420KB
CCE SP 2.67.00.11
Mainconcept 1.04.00.03 BTW: Mainconcept skipped frames. God knows why.
TMPGEnc 2.521.58.169
Source File: Mpeg2 704x576, 6971KB
Here is the link:
http://www.krassi.de.tf/comparison.html
My personal opinion:
TMPGEnc CQ mode is best, followed by CQ and VBR mode of CCE. This is only the case with a bitrate near 1000, over a value of 2000 CCE and Mainconcept will be better.
Just my 2 cents.