I personally think their care is a LOT easier the larger the tank. When I kept bettas in bowls I had to change the water every couple of days. I have a betta in a 10 gallon, and a betta in a 5 (Filters, with lights and plants,etc). And they are doing amazing. My boy Fusia (In the 5 gallon) is almost 5 years old.
I personally don't like bowls, but as long as their water is changed don't see a problem with them.