MY OPINIONAfter comparing the threads in the picture above, I found the DMC thread to be the most superior when closing rings and making JK, Lizbeth rated 2nd, Coats and Clark 3rd and Venus 4th. Though the Venus thread is great looking and has the brightest white and the silkest look, I found it the worst for closing rings. The thread split the easiest and impossible to reopen a ring. Lizbeth thread was good reopening rings but had a slight drag when closing a ring.
For being a size 70 thread it tatted up smaller than the DMC size 80 thread. Matter of fact, it seems like the DMC thread tatted up the same size as a 60 thread. overall, in my opinion I would choose the DMC 80 and Lizbeth 80 size thread over the Venus size thread any day.
I am not a proficient tatter with size 60, 70 or 80 size threads, but I do know what worked well and felt great when forming rings.