What Is The Best Blue Ray Upconvert DVD Upconvert Or Blue-ray?

DVD upconvert or Blue-ray? - what is the best blue ray upconvert

I missed a blue ray for a while, but now I hear you Upconvert DVDs are almost as good as Blu-ray and there are no problems with BlazeDS, by the time it takes to load and so on. My question is, this is a significant difference bewteen Upconversion & BlazeDS?