Hehe, I am kind of exception from the rule as it seems. I have prefered gr.A over gr.B but absolutely prefer the current WRC to stay the top class over the R5.
I have voted mainly according to the spectacle (in my eyes of course) and the reason why I like the Gr.A cars more than Gr.B is that I'm from an asphalt country. The Gr.B cars weren't very impressive on asphalt, often quite the opposite, they were overpowered but ridiculously clumsy. On the other hand the gr.A cars of the early 90' were likely the most spectacular cars on asphalt ever, at least for me.
https://www.youtube.com/watch?v=-bTEAHdBK3A