Hi Lewis , Vixen .
I have an Ioptron IEQ45 , now thats a mount .
Between the 2 you mention'd and my IEQ45 , well ?? , thats 3 now .
I have found over the last year that Ioptron's software is a lot better than both SW's and Vixens , and my mount has not missed a beat , ever .Great set ups , accurate as ....
On the SW and Vixen , well ? the mechanicals of the Vixen are a lot better , but the software , as I have seen needs a lot to be desired , where SW's software is well sorted now .
Great Question Lewis .
Look at the Ioptron's mate .
.
Brian.