Don't even worry about the seal. The nasties only fall. They cannot crawl up under the lid and squeeze through to get to your beer. The only thing missing will be bubbles in your airlock.
I prefer Better Bottles because the stopper seals well, you can see what is happening, there is no lid to wrestle on and off and they are lighter and safer than glass carboys.
I also feel they are easy to clean - even easier than a bucket. Soak in oxyclean. rinse, add some hot water and a washcloth, swirl, rinse some more and done.