Difference between betta and Chinese and Siamese fighters

Was looking at starting a betta tank and the pet shop said there is no difference between bettas and fighters

 

Siamese Fighting Fish is an old common name while the scientific name is Betta splendens

 

Thanks

 

And what is the best tank size for one

 

Some people will say that 5 gallons is the minimum but I find they appreciate as much swimming space as they can get. The volume and height aren't as important as the footprint so a long, low tank is ideal if you can find one. I have a 6.6 gallon bookshelf tank that's about 2 feet long and it's perfect!

 

Thank you for the advice would love a betta tank such beautiful fish

 

As you can see in my pic, the Chinese Fighter does look significantly different.



I researched it on the internet and this is what I found: