Beastgrip Anamorphic

I can't find any review comparing the Beastgrip anamorphic and the OG moondog lab anamorphic.  Both are selling $175.  But if you were to buy the moondog then you need an adaptor for the Beastgrip.  I don't fully understand why but that's what moondog says.  I am surprised I can't find anything comparing the two.  I am easily surprised.  Most if not all reviews on the Beastgrip anamorphic are pretty much from the company, I don't even think there is a third party review on this.  I imagine the clip-on version of the moondog should have the best alighment as it's clip on, there is no misalignment to fiddle about the vertical and horizontal.  But then since the clip on is pretty much phone specific, so about every two years you are faced with the planned obsolesce, you upgrade the phone you most likely need to update the anamorphic adaptor as well.  Most people aren't made of money.  The screw-on adaptor makes a bit more sense if you are good at aligning the adaptor to the phone's lens.  I am speaking like a true desktop phone videographer as I have absolutely zero experience using the anamorphic adaptor.