OK, reading this thread I think I may stir things up, which is not my intention.
Firstly, IMHO, you cannot beat traps for moles (except strychnine). Gassing is expensive, and unreliable, and those of you who proudly shout about your BPCA qualifications should know how to carry out a COSHH assesment prior to use, and when you have done that, you should know that you should use the least toxic method (trapping) first.
When it comes to which is the better product, for my money its Talunex. Its safer to use, and it goes further. As someone else has also stated, it seems to go off quicke