I used a round tube for years. Switched to a Fish Cat 4 about 4 years ago. I will never go back to a round tube. Fish cat is a way more maneuverable, plus you sit much higher out of the water (warmer). Fish cat is also a lot quicker for long distance travelling. I also store a dry bag in the space behind the seat so I can take more clothes/food/equipment with me than I could with a round tube.
I fish with an 8lb anchor....just cause I like to catch lots of fish (rarely troll). My friends with pontoon boats use their Fish cat 4's 10x more than their pontoon boats (way less wind problems and faster setup time).