I have R-1ed a paddle cat for many years on lots of rivers,(Gilman Gorge, Arkansas, Clear Creek, Bailey, South Boulder Creek, Upper Yough etc) I have not R-1ed round boats much though so I cannot give you much of a comparison between the two.
With that said I like the paddle cat since your weight is on a single tube which I think tracks great and is pretty fast, also on tighter more technical sections you can straddle rocks or even lift up the unweighted tube to slide through narrow slots.
If you do decide on a paddle cat then you need to determine which one is best for you, as there are many to choose from now.
Shredder- the original, great design, light weight great for air travel, lighter material not great for western sharp rock
Hyside- Looks like a good design more durable than shredder
Aire- looks like a good design, bit heavier than the rest which makes portages or hike in hike out sections harder
RMR- have not seen it yet
Culebra- I personally do not like the design of it, the floor is higher giving less room to brace yourself in and it seems to flip easier than the others.