Everything you ever wanted to know about them both is here http://foc-u.co.uk/index.php/topic,1655.msg95874.html#msg95874I would say go for bars and the lower ones are a good option without looking too big
The only advantage of bungs is that they (may) look a bit neater, so putting both on defeats the ony thing bungs have over bars and I think they both use the same mounting points so you wont get both on.