well, jujitsu & karate uniforms are two different things. karate uniforms are very lightweight & would get torn to shreds after just a couple of jujitsu or judo sessions. judo gis are as durable as jujitsu gis, but fit slightly differently as they have to fit a certain way to be competition legal. generally, they are not as form-fitting as jujitsu gis so that they are easier for your opponent to grip. you can spend anywhere from $25 to hundreds of dollars on a gi.
if you're just looking for a basic, inexpesive gi to get started in, pretty much any brand will do. if you live near a college that offers a judo class, check with the bookstore, they might carry a gi. i recommend single weave over double weave, since doubles are just too damn hot to wear.
as far as the best, that's subjective, but mizuno, koral, & adidas are all respected brands with mid to high level uniforms.
hope this helps,
jf