Only the uncut version is in English, but it's the one that's had real attention: beautiful picture & sound quality. Some of the previously-cut scenes are in Italian with English subtitles, since they were never dubbed in English, or at least no English dub of them survives. Is this the same in the Anchor Bay / Blue Underground version?
The cut versions are Deutsch only, fairly basic remastering, & only interesting for comparison.
There's also interviews with Nero & Milian (in English) & Morricone (Italian) with German subs. Looking at the specs, I wonder if it uses the same content as the Blue Underground release.
I haven't yet seen any Koch Media releases, but I can't think how a release of Companeros could get much better than the Starlight one is. The only thing that's missing is being able to see the full Italian dub with English (or German) subs.