The betta's that we buy are not even close to the ones in the wild. So there really should be no comparison anyway. The betta's are only housed in those little cups as a means of keeping them separate until they find homes, they are by no means meant to live in something that small. 2.5 gallons is the smallest I would go with a betta. I have had them in 1g-55g tanks and I can promise you that most of them are happier in the big tanks. Having kept one in a 1g I can tell you that it is not the best conditons for them and I personally will never do it again.