Each image has its own little idiosyncrasies, and each image works in more or less a similar way, although things may be in a different place to what you are used to.
I will be honest and say that when i had my Vu+ Duo i used to run Blackhole on it as it was my preference for that box, although that was well over 18 months ago and the VIX image has come along in leaps and bounds since then.
Most people get used to an image and inevitably have a tendency to stick to it. Change can be quite hard when your used to a certain piece of firmware. I run VIX now on two of my boxes and now i have got used to it i think its a good strong solid stable image, although compared to the images i used to use, Powerboard VX & SIF Jackal there are a lot of things that are in a different place, and different buttons do different things
The only person who can decide which is the best image for you is you, nobody else can make that decision for you, although people will give you guidance if asked.
The other thing you have to look at is the support from each individual team and how easy it is to access the support you require. Like i've said further back in this post, I like the Powerboard VX image. Its a good solid build and does more or less everything i need it to do, although when things do go wrong, getting support from their forum which is mostly in German isn't exactly the easiest as i can't speak or read German that well. Its the same with SIF other than its Italian not German.
What i have always said to people when asked, is try different images and the stick to the one you get on with the best. At the end of the day its your receiver so its up to you what image you put on it.
Nano