Except that - just a few posts up, I showed you that the two were identical in almost every respect. I'll do it again.
A system of subjugation and oppression in which a people were dehumanized, stripped of property, stripped of rights, displaced from their homelands and ultimately slaughtered by the milllions.
Am I describing the Holocaust or am I describing Colonialism ? Both. That description fits both perfectly well. 
If anything though, colonialism was 'worse' - not in kind but in degree. The Holocaust killed between 6 and 10 million people. Colonialism, in Africa, killed at least 10 million (and probably 20) in the Belgian Congo alone ! 
Simply put Colonialism is what the Holocaust would have looked like if it was allowed to go on for 300 years.

There's nothing facile or 'whataboutery' about that, it's simply a factual comparison of what both these horrors consisted off. To declare either a 'lesser' evil is to grossly misrepresent how inexcusably evil they both were.