Just go with which one you think you would like. The TLF is smaller I think but it has the hanging hook so you can hang it on the side of your sump if you want. Other than that they are both just plastic containers. Nothing special about either one.
The red button on top of the BRS reactors doesn't do anything for me. I always try to use it to purge air or whatever and it doesn't do crap. LOL.