I'm trying to decide whether the Kenko 300 1.4x or 2x teleconverter or the Kenko extension tubes would be more suited to my macro work. I am wanting to take it beyond 1:1 and get some really close up insect shots with my Canon 100mm 2.8 macro.

I've done a lot of Googling and reading but a fair few of the sites seem to contradict each other and I'm unsure which to order.

Does anyone have any experience with either of these, or know any useful information?

Thanks