Best and worst bjj rash guards?

Under Armour guards are really good bjj rash guards although its not a famous brand it has a very very hi quality and almost 1/4th of the price i really plan on buying more also there really good for grappling and its the closest thing to grappling shirtless without the staph infection.
it also has really good customer service...
I buy $10 super hero rash guards like the one in my avatar, from Wal-mart. I wear them every day for Muay Thai and Gracie Jiu Jitsu and so far all of them have held up for the last two or three years.