I have a donut tube, a canoe, and a sit-in kayak
The 'tube is rarely used.. hike/walk in stuff only.
The canoe is for fresh water excurtions. Extra room to stretch out, you can stand to cast ... and I love up stream poleing.
Where the kayak really shines is in the salt. The speed of the 'yak makes traveling long distances easy. Plus the 'yak is so stable that there is no worrys paddling in high seas.
Casting from a 'yak may not be a picnic, but they make up for that in fun and safety.