I'd rather Jar Jar's dialogue all be removed. The idea that he's responsible for the clone army being ordered, for starting the mythical clone wars, is beyond awful. And if that plot point is taken out there's no need for any Jar Jar dialogue at all.

Re his prominent role in TPM. I don't think it's a big deal if Jar Jar's all but cut out of Ep 2. Qui Gon is - and he's a far more important part of TPM.

That said, if his dialogue is to be kept I'd definitely prefer an alien language to an English dub.