i dont think people are thinking this through properly ... by the way u said it i assume u dont mean bijuu mode but 4 tails naruto for example...
my answer is yes i do believe gaara has a gd chance because his jutsu can be used on a very large scale.. the match up again such as opponent is a rather gd one for gaara ... gaara would however be in more trouble the closer he is to the opponent ... but we know he can use his sand to fly away to a high place.. this proves to be a very useful thing in such a battle .. i would say gaara has a gd chance both in a desert and not in a desert.. he would simply turn the area into a desert if he has to...
btw do u mean someone in control of there V2 like bee or someone out of control like naruto was ?
and are u on about specifically bee and naruto or absolutetly any jinchurikee .. because in any normal circumstance we can safely say that naruto > gaara